A lake.
Actually there is more water on this planet so the water completely surrounds the land.
Water, usually. But, an "island" can be anything including a raised platform within a merchant store that is used for security/visibility concerns.
peninsula
Amoeba surrounds completely its prey with ithe projections of the protoplast , that are called pseudopodia. and along with some water, it takes in the prey within its cell. The process is called phagocytosis.
An island is a physical feature that is completely surrounded by water. A harbor, on the other hand, is a sheltered body of water where ships can anchor and dock.
An ocean is a large body of salt water that surrounds a continent. Oceans cover about 71% of the Earth's surface.
The water surrounding a castle is called a moat however most castles did not have a moat.
Bahrain is an archipelago of islands completely surrounded by the Persian Gulf.
The Southern Ocean surrounds the continent of Antarctica.
It's called a moat, and it is usually filled with water.
The Cuticle
It is called being submerged.