What are some major bodies of water in the mid Atlantic region?

I'm guessing the world's oceans would qualify, as might the Mediterranean Sea, Gulf of Mexico, Arabian Sea, Baltic Sea, Bering Sea, Caribbean Sea, Bay of Bengal, Red Sea, East China Sea, South China...

There are, of course, innumerable sounds and bays in the Canadian maritimes, however, in addition to the Atlantic ocean itself, the two most notable bodies of water are the Bay of Fundy and the Gulf...

The Atlantic Coastal Plain

Lake Mead, the Colorado and Gila Rivers.

Santiago River