The Sea of Azov (; , Azovs'ke more; ) is a sea in south-eastern Europe. To the south it is linked by the narrow (about ) Strait of Kerch to the Black Sea, and it is sometimes regarded as a northern extension of the Black Sea. The sea is bounded in the north by mainland Ukraine, in the east by Russia, and in the west by the Crimean Peninsula. The Don and Kuban are the major rivers that flow into it. The Sea of Azov is the shallowest sea in the world, with the depth varying between . There is a constant outflow of water from the Sea of Azov to the Black Sea.