ケルチ海峡
At the eastern region of Black Sea to the south of the Kerch Strait the Ukrainian Economic Zone adjoins the Russian Economic Zone in Black Sea. From that point starts the Russia - Ukraine border of territorial water which stretches northward for towards the southern edge of the Kerch Strait. After that the boundary continues as the Russia - Ukraine border though the Kerch Strait () and over the Azov Sea () where it divides the internal waters of both countries towards the edge of land border on the northern coast of Azov Sea. The total length of the sea border consists of , out of which stretches over the Black Sea.