Okay kiddo, let's talk about the four seas. Imagine you're standing in the middle of a big circle. Now, let's draw four lines to divide this circle into four equal parts. Each part is like a different section of the circle.
Now, let's name these sections after the different seas that border them. The first section is the North Sea, the second section is the Atlantic Ocean, the third section is the Mediterranean Sea, and the fourth section is the Black Sea.
Just like how you can splash around in a bathtub or swimming pool, people and animals can swim in these seas. They are connected by what is called a "strait," which is like a narrow path of water that connects two larger bodies of water.
So, when people talk about the "four seas," they are referring to these different sections of the circle that are filled with water and connected by straits. It's just like how you might divide up a pizza into four slices and share it with your friends. Each slice is a different part of the pizza, just like each sea is a different part of the circle.