A lake.
I think you have your English language mixed up'. A body of land almost completely surrounded by water is a 'peninsula'. A body of water almost completely surrounded by land is a 'lagoon'. or 'inlet'.
The Mediterranean Sea was the body of water completely surrounded by the Roman Empire.
The Roman empire was never completely surrounded by any body of water.The Roman empire was never completely surrounded by any body of water.The Roman empire was never completely surrounded by any body of water.The Roman empire was never completely surrounded by any body of water.The Roman empire was never completely surrounded by any body of water.The Roman empire was never completely surrounded by any body of water.The Roman empire was never completely surrounded by any body of water.The Roman empire was never completely surrounded by any body of water.The Roman empire was never completely surrounded by any body of water.
A mere, a lake or an inland sea.
An island is a body of land completely surrounded by water.
You misunderstand. A lake is a body of water completely surrounded by land. Or A body of land completely surrounded by water is and island, or isle. NB Other words for 'lake' are mere, pond, pool and flash. The use of these words depends on their context.
This could be a number of things. A pond, a lake, an inland sea, etc.
That is a lake, or a sea.
The Tiber river.!
A lake?
a fresh water pond
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.