A body of water such as you describe would be the ocean itself.
A bay is a wide-mouthed area where the water from the ocean or a sea becomes partially surrounded by a land mass. A peninsula is a projection of land into a large body of water such as the ocean or a sea.
Antarctica is surrounded by the Southern Ocean.
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ocean
Ocean
A body of water almost completely surrounded by water is called an ocean. Oceans will often run into each other.
A sea is part of an ocean that is partially surrounded by land. If it is totally surrounded, then it's called an inland sea. An ocean is a body of salt water with no boundaries and limitless volume. It's limitless because with no boundaries, definitive quantity cannot be deduced. Between the two, the ocean is the larger of the two.
a bay
A lake is a body of water surrounded by land. Lakes are typically enclosed bodies of water that are not directly connected to the ocean.
Delaware is not surrounded by a body of water. It has the Atlantic Ocean to its east, and Delaware Bay to the north.
ocean
Antarctica is surrounded by the Southern Ocean.