For my fantasy world, I have what I think is a really cool idea. The world is flat, and elliptical in shape. If you touch the silvery edge, well, let's just say bad things will happen. (Not relevant...) This edge is an impenetrable, indestructible wall.

Assume that gravity is magically inclined to drag everything down with 1g of force. Also assume that the entire surface of both sides are uniformly heated throughout the year.

Anyway, surrounding the continent in the center of the map, there is an ocean. This ocean is one mile deep. Now, mirror this image. There is a bottom half, the exact same as the top.

My question is, how would aforementioned changes affect the ocean?