INTERNATIONAL DAY

World Hydrography Day

On June 21, we recognize the vital contributions of hydrography to our environment and navigation systems, showcasing its global significance.

JUN21
Monday, June 21Every year on June 21
 days to go
Roots
Established in 2005 by the International Hydrographic Organization
Vibe
A day to reflect on our relationship with water
Hashtag
#WorldHydrographyDay
Apple or Outlook calendar

3 ways to celebrate

AT HOME

Explore ocean maps

Browse nautical charts online and trace famous sea routes.

WITH FRIENDS

Visit the waterfront

Walk the shore and talk about what lies beneath.

AT WORK OR SCHOOL

Map your commute

Chart your route like a voyage and share the map.

Fast facts

Over 70%Of the Earth's surface is covered by water
More than 80%Of global trade is conducted via maritime routes

The story

World Hydrography Day, celebrated annually on June 21, emphasizes the crucial role that hydrography plays in understanding and managing our water resources. Initiated by the International Hydrographic Organization (IHO) in 2005, this observance aims to raise awareness about the significance of hydrographic data in navigation, environmental protection, and maritime activities. It serves as a reminder of how hydrography contributes to safe and efficient maritime operations.

Read the full story

Hydrography is not just about mapping the depths of oceans and rivers; it encompasses the study of water bodies and their characteristics, including currents, tides, and underwater topography. This knowledge is essential for safe navigation, as it helps mariners avoid hazards and ensures the efficient transport of goods. The information gathered by hydrographers aids in the preservation of marine environments and supports sustainable practices worldwide.

On this day, various events are organized globally, including educational workshops, community clean-ups, and public discussions on the importance of water conservation. Schools often participate by integrating hydrographic studies into their curricula, fostering a sense of responsibility among young people regarding water resources. Engaging the community in these activities not only raises awareness but also promotes collective action toward preserving our waterways.

As we celebrate World Hydrography Day, let us recognize the dedicated professionals who work tirelessly to gather and disseminate vital hydrographic data. Their efforts contribute to safer seas, sustainable practices, and a deeper understanding of our planet's water resources. It is a call to action for individuals and communities to appreciate and protect our precious waterways, ensuring they remain a source of life and beauty for generations to come.

Did you know?

01

Hydrography Defined

Hydrography is the science of measuring and describing the physical features of water bodies.

02

Global Trade

Over 90% of the world's trade is transported by sea.

03

IHO Membership

The International Hydrographic Organization has 100 member states.

04

Water Coverage

Approximately 97% of the Earth's water is saltwater.

05

Maritime Hazards

Hydrographic surveys help identify hazards like reefs and wrecks.

06

Ocean Currents

Understanding ocean currents is essential for navigation and climate science.

07

Shallow Water Mapping

Shallow waters are often the most difficult to map accurately.

Around the world

Every culture celebrates a little differently.

  • USUnited StatesHome to vast rivers and lakes, the U.S. celebrates its waterways on this day.
  • CACanadaWith its abundant freshwater resources, Canada plays a key role in hydrographic studies.
  • GBUnited KingdomThe UK emphasizes the importance of its coastal waters and navigation safety.
  • AUAustraliaAustralia's unique marine environments are highlighted during World Hydrography Day.
  • FRFranceFrance promotes hydrography through its extensive maritime activities and research.
  • BRBrazilHome to the Amazon River, Brazil's waterways are vital for biodiversity and research.

Keep the party going

See the calendar
FROM THE NATIONAL DAY CALENDAR STORE

Celebrate every day, all year

Official gear from the people who track 1,700+ celebrations.

Browse the shop
2027 National Day Desk Calendar2027 National Day Desk CalendarA new celebration every morning. Daily tear-off.Shop now