And a continent is just a really big island.

Therefore a continent is actually just a big mountain.

From another point of view, the oceans are just a thin film of water clinging to the surface of this ball of rock.

The depth of the oceans is a rounding error compared to the depth of the planet.

Salt lakes typically have rivers containing trace amounts of salt flowing into them but no rivers flowing out. That means the only way water can leave is through evaporation, but the salts get left behind and the salinity therefore builds up.

I learned this in Geography 101. Then I had a shower thought that the oceans of the world are just a giant salt lake.

Tis known

And the sea is just a big lake. The sea floor a long valley. Fish are valley people. Land animals are mountain folk.