It’s not near a sea.

Such terms can be found in many web sites around the world, but are

often misspelled. Sea = Sea. In other words, the ocean is what covered many layers of earth

around it?

What is sea and what are the definitions below it? What is the

smallest of the black seas?

Second, we have

A large lake

You are using this definition when you talk about “the Sea of Galilee” despite the fact that the Sea of Galilee is not really a sea in the usual sense but is actually a lake.

But in general, unless there is some reason you are specifying a certain sea or group of seas, you can use the word “sea” to basically mean “all the oceans and all of the seas”.