ELI5: Explain Like I'm 5

World Hydrography Day

Happy World Hydrography Day! Let's talk about what hydrography is and why it's important to celebrate this day.

Hydrography is the study of water and everything about it, like the depth, shape, and currents of the sea, the location of all the rivers, lakes and waterways, and how the water in the earth moves. This information is very important for many different reasons.

On World Hydrography Day, we celebrate the people who work every day to gather and use this information, the hydrographers. They help us to understand where to build important things like bridges, dams, and ports; how to protect marine life and the environment; and how to make sure that people can safely travel and work on the water.

So why do we need a whole day to celebrate hydrography? Well, because it's a vital part of our world that many people don't know much about. Without hydrography, we wouldn't know where it's safe to sail, deposit waste, or where people are able to swim safely. By learning about hydrography, we can learn how to protect ourselves and the environment.

In short, World Hydrography Day is a day to give thanks to the people who work hard to understand the water in our world and help guide us how to use it responsibly.