A lake.
A body of fresh water surrounded by land is a lake or pond.
Lake
a fresh water pond
lake
a fresh water pond
pond
A lake is a large body of water that is surrounded by land a body of (usually fresh) water surrounded by land
A lake, or an inland sea.
A bay is a body of water that is partly enclosed by land (and is usually smaller than a gulf).
A freshwater lake.
A body of fresh or salt water of considerable size, surrounded by land
A body of land surrounded by water is called an island. Australia is surrounded by water but not considered an island because it is far too big to be considered one.Edition: I think an island can be any size.