Which sea is known as white sea?

The White Sea is an inland sea in the north of the European part of Russia that belongs to the Arctic Ocean.

Is this the same as black sea?

The Black Sea, also known as the Euxine Sea, is one of the major water bodies and a famous inland sea of the world. This marginal sea of the Atlantic Ocean, located between Eastern Europe and Western Asia, has become legendary for a long period of time.