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World Hydrography Day

Dive into World Hydrography Day and explore the depths of our oceans through fascinating maps, charts, and data. Let's celebrate our planet's water resources!

Sunday

June 2026

Last updated February 7, 2026 · by the Holiday Calendar Team

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YEARLY DATEJune 21

OBSERVED INUnited States

CATEGORYNature

SUBCATEGORYOcean

INTRO

Introduction

PHOTO

Get ready to make a splash on June 21, as we celebrate World Hydrography Day! This international holiday was established by the International Hydrographic Organization (IHO) in 2005 to raise awareness about the importance of hydrography – the science of measuring and charting bodies of water. From ancient civilizations using basic instruments to modern technology mapping every inch of our oceans, hydrography has come a long way and plays a crucial role in ensuring safe navigation and protection of marine life. So let's dive into this exciting holiday and learn more about the fascinating world of hydrography!

TIMELINE

World Hydrography Day Timeline

Early Hydrography

During the 1800s, hydrography began to develop as a science, with countries around the world establishing national hydrographic offices.

IHO Founding

The International Hydrographic Bureau, now known as the International Hydrographic Organization (IHO), was established in Monaco to coordinate global hydrography efforts.

UN Recognizes IHO

The United Nations recognizes the IHO as the competent authority in hydrographic surveying and charting.

Advances in Technology

New technological advancements, such as GPS and sonar, significantly improved the accuracy and efficiency of hydrographic surveys.

World Hydrography Day Established

The IHO established World Hydrography Day to raise global awareness about the importance of hydrography.

GET INVOLVED

How to Celebrate World Hydrography Day

Go on a boat tour

What better way to celebrate World Hydrography Day than by taking a boat tour? Explore the beauty of the world's waterways and learn about the importance of hydrography in mapping and navigation.

ATTEND

Attend a lecture or workshop

Many organizations and institutions offer lectures and workshops on hydrography and its impact on our world. Attend one to learn more about this important field and its contributions to society.

SUPPORT

Support a marine conservation organization

In honor of World Hydrography Day, consider supporting a marine conservation organization that works to protect our oceans and waterways. Your donation can make a difference in preserving these vital resources for future generations.

HOST

Host a beach clean-up

Gather some friends and family and organize a beach clean-up to celebrate World Hydrography Day. Not only will you be helping to keep our oceans clean, but you'll also be raising awareness about the importance of protecting our waterways.

TAKE

Take a virtual dive

Thanks to technology, we can now take virtual dives and explore the depths of our oceans without even getting wet! Celebrate World Hydrography Day by taking a virtual dive and learning about the amazing marine life that exists below the surface.

WHY THIS DAY MATTERS

Why World Hydrography Day is Important

Supports sustainable use of resources

Hydrographic data is not only used for safe navigation but also for the sustainable use of marine resources. Accurate charts of the seabed and coastline help with planning and managing activities such as fishing, offshore energy production, and mineral extraction. By recognizing World Hydrography Day, we show our appreciation for the important role hydrographers play in promoting sustainable development.

Promotes safe and efficient navigation

World Hydrography Day raises awareness about the importance of accurate and up-to-date nautical charts in ensuring the safety of ships and crews. By highlighting the role of hydrography in providing reliable information about tides, currents, and depths, this day helps to promote safe and efficient navigation.

Safeguards marine environment

Hydrography is also essential for protecting the marine environment. Accurate nautical charts help mariners avoid sensitive areas such as coral reefs, seagrass meadows, and other important habitats. By safeguarding these ecosystems, World Hydrography Day plays a crucial role in preserving our oceans for future generations.

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