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sea
It is an island, which is a piece of land surrounded on four sides by water.
a gulf!
A body of fresh or salt water of considerable size, surrounded by land
A body of fresh water surrounded by land is a lake or pond.
A lake is the biggest body of water that is surrounded by water on all sides. The largest lake in the world is the Caspian Sea - so called because it is comprised of salt water and the ancient Romans called it a sea like every other salt water body they had encountered. However, as the Caspian Sea is bounded by land on every side, it is by definition a lake.
Smaller bodies of salt water usually surrounded by land are called seas. An example would be the Dead Sea between Israel and Jordan.
A lake is the biggest body of water that is surrounded by water on all sides. The largest lake in the world is the Caspian Sea - so called because it is comprised of salt water and the ancient Romans called it a sea like every other salt water body they had encountered. However, as the Caspian Sea is bounded by land on every side, it is by definition a lake.
A body of body surrounded by land is can be referred to by several different names. A lake - Generally a freshwater body of water that is fairly sizable. A sea - Usually a saltwater body of water with no outlet to the ocean (such as the Dead Sea). A pond - A smaller body of water than a lake. Usually man made. Usually the preferred term for a large freshwater body of water would be "lake" and a large body of salt water would be a "sea".
low land covered by water
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.
One type of body of water completely surrounded by land is a lake. The opposite of that would be an island. Other types of bodies of water surrounded by land include ponds, reservoirs, rivers and streams that run to a pond or reservoir, and inland seas. There are many bodies of water that are also completely surrounded by water until the tides come up; they may be tidal pools, lagoons, or salt marshes.