Ceyuan haijing is a very big and important book that talks about the ocean and all the creatures that live in it. It was written a long, long time ago by some very smart people who wanted to learn more about the ocean and make sure everyone knew how special it was.
The book is written in a language that some people might find a little hard to understand, but it has lots of pictures to help tell the story. The pictures show all kinds of ocean creatures like fish, crabs, and even big animals like whales and sharks.
The book talks about how the ocean is really big and deep and covers almost all of the world. It also talks about how important the ocean is to people and all the animals that live on land too. The ocean helps keep the air healthy by making sure there's enough oxygen for us to breathe, and it also helps control the weather and the temperatures on land.
So, in short, ceyuan haijing is a very special book that teaches us all about the ocean and how important it is to take care of it. Even though it was written a long time ago, it's still just as important today as it was back then.