The sea is really just land covered  in water. Space filled with very-wet instead of mostly-dry. Try telling that to the sea, though. The sea wouldn’t hear any of it. It would just say “No no, I’m the sea. Majestic, blue and deep”. I wonder what would happen if you took all the water from the sea and put it in a big bag, and locked it in the fridge for a while. Its naked bed would shiver for a while. I’d hope that it might see the land around itself and realise it was part of the same stuff.