an ocean
An ocean is the largest body of water. The next largest is called a sea.
It is called a sea. An ocean is a large body of salt water, but the sea is what they probably mean.
sea
A large inland body of water is called a lake.
Gulf of Finland, Baltic Sea, Gulf of Riga
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.
Large bodies of salt water are called seas or oceans.
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".
The Caspian Sea.
The Atlantic Ocean to the West, the Irish Sea to the East, the North Sea to the....North!
Simply because of their size - the word "sea" implies a very large body of water.
The Black Sea is the large body of water north of Turkey.