{"id":3760717,"date":"2023-06-07T14:35:21","date_gmt":"2023-06-07T09:05:21","guid":{"rendered":"https:\/\/entri.app\/blog\/?p=3760717"},"modified":"2025-06-12T14:11:37","modified_gmt":"2025-06-12T08:41:37","slug":"world-hydrography-day","status":"publish","type":"post","link":"https:\/\/entri.app\/blog\/world-hydrography-day\/","title":{"rendered":"World Hydrography Day 2025: Theme, History, Significance"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69d416c48d65b\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69d416c48d65b\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#World_Hydrography_Day_2025_Date_%E2%80%93_June_21\" >World Hydrography Day 2025 Date \u2013\u00a0 June 21<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#Hydrography_and_its_Significance\" >Hydrography and it\u2019s Significance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#How_Hydrography_is_carried_out\" >How Hydrography is carried out?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#History_of_World_Hydrography_Day\" >History of World Hydrography Day<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#World_Hydrography_Day_Theme_2025\" >World Hydrography Day Theme 2025<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#World_Hydrography_Day_Previous_Themes\" >World Hydrography Day Previous Themes\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#How_World_Hydrography_Day_is_celebrated\" >How World Hydrography Day is celebrated?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#World_Hydrography_Day-_Messages\" >World Hydrography Day- Messages<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#World_Hydrography_Day_Quiz_2025\" >World Hydrography Day Quiz 2025<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/#World_Hydrography_Day_Quiz_2025_PDF\" >World Hydrography Day Quiz 2025 PDF<\/a><\/li><\/ul><\/nav><\/div>\n<p><strong>World Hydrography Day <\/strong>is celebrated on June 21 every year, since 2005<strong>. <\/strong>It is celebrated to raise awareness of the importance of hydrography and to publicise the work of hydrographers all around the world. Hydrography is the science that measures and describes the physical features of the navigable portion of the Earth&#8217;s surface and adjoining coastal areas.International Hydrographic Organization (IHO) proposed World Hydrography Day in the United Nations. World Hydrography Day is an opportunity for hydrographers around the globe to highlight the significance and importance of their activities. Also hydrographers based on data received suggests initiatives that support the safety of navigation, the protection of the marine environment, coastal zone management, marine spatial data infrastructures, defence and security, resource exploration, and all other components of the blue economy. In this article we will check the significance, theme and history of World Hydrography Day<\/p>\n<div class=\"alert alert-info\">\n<p style=\"text-align: center;\"><strong>World Hydrography Day 2025 Quiz\u00a0<\/strong><\/p>\n<div class=\"lead-gen-block\"><a href=\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2023\/06\/World-Hydrography-Day-Quiz.pdf\" data-url=\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2023\/06\/World-Hydrography-Day-Quiz.pdf\" class=\"lead-pdf-download\" data-id=\"25565347\">\n<p style=\"text-align: center;\"><button class=\"btn btn-default\">DOWNLOAD FREE QUIZ PDF<\/button><\/p>\n<\/a><\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"World_Hydrography_Day_2025_Date_%E2%80%93_June_21\"><\/span><strong>World Hydrography Day 2025 Date \u2013\u00a0 June 21<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In this article readers can get a glimpse on<\/p>\n<ul>\n<li>History and Significance of World Hydrography Day<\/li>\n<li>World Hydrography Day Theme 2025<\/li>\n<li>World Hydrography Day Quiz<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Hydrography_and_its_Significance\"><\/span><strong>Hydrography and it\u2019s Significance<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrography is the branch of applied sciences which deals with the measurement and description of the physical features of oceans, seas, coastal areas, lakes and rivers, as well as with the prediction of their change over time. The important factor of hydrography is to\u00a0 provide safety of navigation and in support of all other marine activities, including economic development, security and defense, scientific research, and environmental protection of country.<\/p>\n<p>Hydrographer measures and searches for rocks and wrecks\u00a0 that could be hazardous to navigation. They also collect information on water levels, tides, currents, temperature and salinity. Hydrographers conduct hydrographic surveys to measure the depth and bottom configuration of water bodies. The data\u2019s received from these surveys are used to update nautical charts and develop hydrographic models. The information gained from these is vital on safer navigation in the ocean and to understand our nation&#8217;s waterways.<\/p>\n<p><strong>Other Important benefits of Hydrography is as follows-<\/strong><\/p>\n<p>&#8211; Resource exploitation &#8211; fishing, minerals<br \/>\n&#8211; Environmental protection and management<br \/>\n&#8211; Maritime boundary delimitation<br \/>\n&#8211; National marine spatial data infrastructures<br \/>\n&#8211; Recreational boating<br \/>\n&#8211; Maritime defense and security<br \/>\n&#8211; Tsunami flood and inundation modeling<br \/>\n&#8211; Coastal zone management<br \/>\n&#8211; Tourism<br \/>\n&#8211; Marine science<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Hydrography_is_carried_out\"><\/span><strong>How Hydrography is carried out?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrographers conduct hydrographic surveys to measure the depth and bottom configuration of water bodies. This is done mainly with specialized ships and boats with echo sounders and sonars. Also they use survey aircraft fitted with lasers and data can be derived from satellite observations which helps in monitoring tides and currents.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"History_of_World_Hydrography_Day\"><\/span><strong>History of World Hydrography Day<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The International Hydrographic Bureau was established in 1921, for the purpose of providing a mechanism for consultation between governments on matters such as technical standards, safe navigation and the protection of the marine environment. Which later in 1970, changed it\u2019s name to International Hydrographic Organization (IHO).<\/p>\n<p>IHO first proposed\u00a0 the concept of a World Hydrography Day in 2005\u00a0 at United Nations General Assembly. This idea got acceptance from the United Nations General Assembly in Resolution A\/RES\/60\/30 Oceans and the law of the sea with the aim of giving \u00a0publicity to its work at all level and of increasing the coverage of hydrographic information on a global basis.\u00a0 Also urged all States around\u00a0 globe\u00a0 to work with IHO to promote safe navigation, especially in the areas of international navigation, ports and where there are vulnerable or protected marine areas. The first \u00a0World Hydrography Day was celebrated in 2006.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"World_Hydrography_Day_Theme_2025\"><\/span><strong>World Hydrography Day <\/strong><strong>Theme 2025<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"79\" data-end=\"614\">The theme for World Hydrography Day 2025, <strong data-start=\"121\" data-end=\"165\">&#8220;Seabed Mapping: Enabling Ocean Action,&#8221;<\/strong> emphasizes the essential role of detailed and accurate seabed data in supporting global ocean initiatives. Mapping the ocean floor provides the foundation for understanding marine ecosystems, improving navigational safety, and addressing climate-related challenges. With much of the ocean still unexplored, seabed mapping helps reveal underwater features critical for biodiversity conservation, marine spatial planning, and disaster risk reduction.<\/p>\n<p data-start=\"616\" data-end=\"1204\" data-is-last-node=\"\" data-is-only-node=\"\">This year\u2019s theme highlights the importance of hydrography in advancing the goals of the <strong data-start=\"705\" data-end=\"775\">UN Decade of Ocean Science for Sustainable Development (2021\u20132030)<\/strong>. By gathering data on ocean depths, underwater terrain, and seafloor composition, hydrographic surveys contribute directly to scientific research, environmental monitoring, and responsible ocean governance. The International Hydrographic Organization (IHO) continues to lead global efforts in expanding access to high-quality seabed data, ensuring that informed actions can be taken to protect our oceans for future generations.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"World_Hydrography_Day_Previous_Themes\"><\/span><strong>World Hydrography Day Previous Themes\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-sourcepos=\"1:1-1:408\">World Hydrography Day, observed annually on June 21, was established by the International Hydrographic Organization (IHO) and later welcomed by the United Nations General Assembly in 2005. It aims to raise awareness about the vital role of hydrography in safe navigation, environmental protection, and sustainable use of the oceans, seas, and waterways. The date commemorates the founding of the IHO in 1921.<\/p>\n<p data-sourcepos=\"3:1-3:134\">Each year, a specific theme is chosen by the IHO to highlight different aspects of hydrography. Here are the themes from recent years:<\/p>\n<ul data-sourcepos=\"5:1-23:50\">\n<li data-sourcepos=\"5:1-5:123\"><strong>2007:<\/strong> Electronic Navigational Charts (ENCs); an essential element of safety at sea and efficient maritime operations.<\/li>\n<li data-sourcepos=\"6:1-6:109\"><strong>2008:<\/strong> Capacity <span class=\"citation-27\">Building, a vital tool to assist the IHO in achieving its mission and objectives.<\/span><\/li>\n<li data-sourcepos=\"7:1-7:68\"><strong><span class=\"citation-27\">2009:<\/span><\/strong><span class=\"citation-27 citation-end-27\"> Hydrography &#8211; Protecting the marine environment.<\/span><\/li>\n<li data-sourcepos=\"8:1-8:84\"><strong>2010:<\/strong> Hydrographic Services &#8211; the essential element for maritime <span class=\"citation-26\">trade.<\/span><\/li>\n<li data-sourcepos=\"9:1-9:82\"><strong><span class=\"citation-26\">2011:<\/span><\/strong><span class=\"citation-26\"> Human Resources &#8211; The important element to the success of hydrography.<\/span><\/li>\n<li data-sourcepos=\"10:1-10:88\"><strong><span class=\"citation-26\">2012:<\/span><\/strong><span class=\"citation-26 citation-end-26\"> International Hydrographic Cooperation &#8211; supporting safe navigation.<\/span><\/li>\n<li data-sourcepos=\"11:1-11:56\"><strong>2013:<\/strong> Hydrography &#8211; underpinning the Blue Economy.<\/li>\n<li data-sourcepos=\"12:1-12:69\"><strong><span class=\"citation-25\">2014:<\/span><\/strong><span class=\"citation-25\"> Hydrography &#8211; much more than just nautical charts.<\/span><\/li>\n<li data-sourcepos=\"13:1-13:74\"><strong><span class=\"citation-25\">2015:<\/span><\/strong><span class=\"citation-25\"> Our seas and waterways &#8211; yet to be fully charted and explored.<\/span><\/li>\n<li data-sourcepos=\"14:1-14:69\"><strong><span class=\"citation-25\">2016:<\/span><\/strong><span class=\"citation-25\"> Hydrography &#8211; the key to well-managed seas and waterways.<\/span><\/li>\n<li data-sourcepos=\"15:1-15:78\"><strong><span class=\"citation-25\">2017:<\/span><\/strong><span class=\"citation-25\"> Mapping our seas, oceans and waterways &#8211; more important than ever.<\/span><\/li>\n<li data-sourcepos=\"16:1-16:91\"><strong><span class=\"citation-25\">2018:<\/span><\/strong><span class=\"citation-25 citation-end-25\"> Bathymetry &#8211; the foundation for sustainable seas, oceans and waterways.<\/span><\/li>\n<li data-sourcepos=\"17:1-17:62\"><strong>2019:<\/strong> Hydrographic information driving marine knowledge.<\/li>\n<li data-sourcepos=\"18:1-18:57\"><strong>2020:<\/strong> Hydrography enabling autonomous technologies.<\/li>\n<li data-sourcepos=\"19:1-19:66\"><strong>2021:<\/strong> 100 years of international cooperation in hydrography.<\/li>\n<li data-sourcepos=\"20:1-20:74\"><strong>2022:<\/strong> Hydrography &#8211; contributing to the United Nations Ocean Decade.<\/li>\n<li data-sourcepos=\"21:1-21:69\"><strong>2023:<\/strong> Hydrography \u2013 underpinning the digital twin of the ocean.<\/li>\n<li data-sourcepos=\"22:1-22:108\"><strong>2024:<\/strong> Hydrographic Information &#8211; Enhancing Safety, Efficiency and Sustainability in Marine Activities.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"How_World_Hydrography_Day_is_celebrated\"><\/span><strong>How World Hydrography Day is celebrated?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>World Hydrography Day is celebrated based on the theme selected, which is selected by the Member States of the International Hydrographic Organization (IHO).\u00a0 Based on the theme, IHO develops wide range of activities. Such as-<\/p>\n<ul>\n<li>Awards<\/li>\n<li>Conferences<\/li>\n<li>Seminars<\/li>\n<li>Workshops<\/li>\n<li>Lectures<\/li>\n<li>Dinners<\/li>\n<li>Public events<\/li>\n<li>Demonstrations<\/li>\n<li>Promotional material<\/li>\n<\/ul>\n<p>Also the IHO Secretariat will post Member State and stakeholder initiatives on the dedicated page on the IHO website and\/or social media outlets. Alternatively, contributors are invited to post on their own social media outlets and tag the IHO. Suggested hashtags include #WorldHydrographyDay and #WHD.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"World_Hydrography_Day-_Messages\"><\/span><strong><span data-preserver-spaces=\"true\">World Hydrography Day- Messages<\/span><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><span data-preserver-spaces=\"true\">With the increasing population, we all need to stay alert, and on this extraordinary day, let\u2019s take an initiative that would help us conserve our marine resources.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Hope we all can take out some time from our busy schedule and plan out something to protect our mother Earth\u2019s marine resources on this great day.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">This day is celebrated to acknowledge the work of IHO and to spread the importance of hydrography.\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">It\u2019s us who can save Earth\u2019s resources. Let us contribute to this cause by celebrating this great day.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">\u00a0feel it\u2019s us who can play a very crucial role in this hydrography day to conserve our marine resources. We all need to take a moment out to help each worker of the organization and acknowledge their work.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"World_Hydrography_Day_Quiz_2025\"><\/span><strong>World Hydrography Day Quiz 2025<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong><label class=\"control-label\" for=\"edit-submitted-1-how-many-languages-are-spoken-in-todays-world\">1. When is World Hydrography Day observed?<\/label><\/strong><\/p>\n<p><label class=\"control-label\" for=\"edit-submitted-1-how-many-languages-are-spoken-in-todays-world\">A) June 5<br data-start=\"160\" data-end=\"163\" \/>B) June 21<br data-start=\"173\" data-end=\"176\" \/>C) July 11<\/label><\/p>\n<div>\n<div class=\"alert alert-warning\"><strong>Ans: B)<\/strong><\/div>\n<\/div>\n<div><\/div>\n<div><strong>2. Which organization is responsible for World Hydrography Day?<\/strong><\/div>\n<div><br data-start=\"269\" data-end=\"272\" \/>A) IMO<br data-start=\"278\" data-end=\"281\" \/>B) WMO<br data-start=\"287\" data-end=\"290\" \/>C) IHO<\/div>\n<div>\n<div class=\"alert alert-warning\"><strong>Ans: C)<\/strong><\/div>\n<\/div>\n<div>\n<p><strong>3. Where is the IHO headquarters located?<\/strong><\/p>\n<p>A) Geneva<br data-start=\"369\" data-end=\"372\" \/>B) New York<br data-start=\"383\" data-end=\"386\" \/>C) Monaco<\/p>\n<\/div>\n<div class=\"radio-button-container \">\n<div class=\"alert alert-warning\"><strong>Ans: C)<\/strong><\/div>\n<\/div>\n<div><\/div>\n<div><strong>4. What does hydrography mainly deal with?<\/strong><\/div>\n<div><strong><br data-start=\"457\" data-end=\"460\" \/><\/strong>A) Weather forecasting<br data-start=\"482\" data-end=\"485\" \/>B) Ocean and seabed mapping<br data-start=\"512\" data-end=\"515\" \/>C) Desert studies<\/div>\n<div>\n<div class=\"alert alert-warning\"><strong>Ans: B)<\/strong><\/div>\n<\/div>\n<div><\/div>\n<div>\n<p><strong>5. What is bathymetry the study of?<\/strong><\/p>\n<p>A) Rainfall<br data-start=\"601\" data-end=\"604\" \/>B) Ocean depth<br data-start=\"618\" data-end=\"621\" \/>C) Wind speed<\/p>\n<div class=\"question-body clearfix notranslate \">\n<div class=\"\">\n<div class=\"answer-option-cell\">\n<div>\n<div class=\"alert alert-warning\"><strong>Ans: B)<\/strong><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><strong>6. Which instrument is commonly used to measure depth underwater?<\/strong><\/div>\n<div><strong><br data-start=\"719\" data-end=\"722\" \/><\/strong>A) Radar<br data-start=\"730\" data-end=\"733\" \/>B) Sonar<br data-start=\"741\" data-end=\"744\" \/>C) Barometer<\/div>\n<div>\n<div class=\"alert alert-warning\">\n<div><strong>Ans: B)<\/strong><\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><strong>7. What is a key output of a hydrographic survey?<\/strong><\/div>\n<div><br data-start=\"825\" data-end=\"828\" \/>A) Road maps<br data-start=\"840\" data-end=\"843\" \/>B) Climate charts<br data-start=\"860\" data-end=\"863\" \/>C) Nautical charts<\/div>\n<div>\n<div class=\"alert alert-warning\"><strong>Ans: C)<\/strong><\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><strong>8<\/strong>. <strong data-start=\"897\" data-end=\"950\">How often is World Hydrography Day celebrated?<\/strong><\/div>\n<div><br data-start=\"950\" data-end=\"953\" \/>A) Monthly<br data-start=\"963\" data-end=\"966\" \/>B) Annually<br data-start=\"977\" data-end=\"980\" \/>C) Every five years<\/div>\n<div>\n<div class=\"alert alert-warning\"><strong>Ans: B)<\/strong><\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><strong>9. Which profession is mainly involved in hydrography?<\/strong><\/div>\n<div><\/div>\n<div>A) Geologist<br data-start=\"1088\" data-end=\"1091\" \/>B) Hydrographer<br data-start=\"1106\" data-end=\"1109\" \/>C) Meteorologist<\/div>\n<div>\n<div class=\"alert alert-warning\"><strong>Ans: B)<\/strong><\/div>\n<\/div>\n<div>\n<h5><strong>Want More Engaging Questions?<\/strong><\/h5>\n<p>Download our <strong>FREE PDF<\/strong> packed with insightful quiz questions to test your knowledge!<\/p>\n<p><strong>\ud83d\udd3d Click below to get your free copy now! \ud83d\udd3d<\/strong><\/p>\n<\/div>\n<div class=\"listicle-detail\">\n<h2><span class=\"ez-toc-section\" id=\"World_Hydrography_Day_Quiz_2025_PDF\"><\/span><strong>World Hydrography Day Quiz 2025 PDF<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"lead-gen-block\"><a href=\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2023\/06\/World-Hydrography-Day-Quiz.pdf\" 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data-end=\"537\">World Hydrography Day serves as a powerful reminder of the vital role that hydrography plays in ensuring safe navigation, protecting marine environments, and supporting sustainable ocean development. From creating nautical charts to enabling emergency response and coastal zone management, hydrographic data supports a wide range of critical activities. As our oceans face increasing pressures from climate change, pollution, and overuse, the importance of accurate seabed mapping and ocean observation continues to grow.<\/p>\n<p data-start=\"539\" data-end=\"1012\" data-is-last-node=\"\" data-is-only-node=\"\">By celebrating World Hydrography Day, we acknowledge the ongoing efforts of hydrographers and maritime organizations working tirelessly to explore and understand our oceans. The 2025 theme reinforces the urgency of seabed mapping in enabling ocean action and contributing to global marine goals. Increased international cooperation, technological innovation, and public awareness are key to unlocking the full potential of our oceans while safeguarding them for the future.`<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>World Hydrography Day is celebrated on June 21 every year, since 2005. It is celebrated to raise awareness of the importance of hydrography and to publicise the work of hydrographers all around the world. Hydrography is the science that measures and describes the physical features of the navigable portion of the Earth&#8217;s surface and adjoining [&hellip;]<\/p>\n","protected":false},"author":54,"featured_media":25613994,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[802,164,558],"tags":[],"class_list":["post-3760717","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-current-affairs","category-general-knowledge"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>World Hydrography Day 2025: Date, Theme, History, Significance<\/title>\n<meta name=\"description\" content=\"World Hydrography Day is celebrated on June 21, every year. It is celebrated to raise awareness of the importance of hydrography worldwide.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/entri.app\/blog\/world-hydrography-day\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"World Hydrography Day 2025: Date, Theme, History, Significance\" \/>\n<meta property=\"og:description\" content=\"World Hydrography Day is celebrated on June 21, every year. It is celebrated to raise awareness of the importance of hydrography worldwide.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/entri.app\/blog\/world-hydrography-day\/\" \/>\n<meta property=\"og:site_name\" content=\"Entri Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/entri.me\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-06-07T09:05:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-12T08:41:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2023\/06\/World-Hydrography-Day.png\" \/>\n\t<meta property=\"og:image:width\" content=\"820\" \/>\n\t<meta property=\"og:image:height\" content=\"615\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Ayshath Nasira\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@entri_app\" \/>\n<meta name=\"twitter:site\" content=\"@entri_app\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ayshath Nasira\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/entri.app\/blog\/world-hydrography-day\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/entri.app\/blog\/world-hydrography-day\/\"},\"author\":{\"name\":\"Ayshath Nasira\",\"@id\":\"https:\/\/entri.app\/blog\/#\/schema\/person\/e8dc9d880b17e7a7c7fdb8d95f0d10ec\"},\"headline\":\"World Hydrography Day 2025: Theme, History, Significance\",\"datePublished\":\"2023-06-07T09:05:21+00:00\",\"dateModified\":\"2025-06-12T08:41:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/entri.app\/blog\/world-hydrography-day\/\"},\"wordCount\":1571,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/entri.app\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/entri.app\/blog\/world-hydrography-day\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2023\/06\/World-Hydrography-Day.png\",\"articleSection\":[\"Articles\",\"Current Affairs\",\"General Knowledge\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/entri.app\/blog\/world-hydrography-day\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/entri.app\/blog\/world-hydrography-day\/\",\"url\":\"https:\/\/entri.app\/blog\/world-hydrography-day\/\",\"name\":\"World Hydrography Day 2025: Date, Theme, History, Significance\",\"isPartOf\":{\"@id\":\"https:\/\/entri.app\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/entri.app\/blog\/world-hydrography-day\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/entri.app\/blog\/world-hydrography-day\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/entri.app\/blog\/wp-content\/uploads\/2023\/06\/World-Hydrography-Day.png\",\"datePublished\":\"2023-06-07T09:05:21+00:00\",\"dateModified\":\"2025-06-12T08:41:37+00:00\",\"description\":\"World Hydrography Day is celebrated on June 21, every year. 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