Well, there are two seas that I know of, that are named by color. One is the Black Sea, and the other is called the Red Sea.
The Red Sea and The Black Sea :D
Green and Sargasso
The Black Sea and the Red Sea.
whit land between two seas blue is the seas
The Black and the Baltic.
There are 2 seas which are separated by the Torres Strait. These two seas are the Coral Sea on the east and the Arafura Sea on the west.
The Black Sea and the Red Sea are named after colors.
There are two: the Red Sea and the Persian Gulf.
Barrow and Juneau :)