Seas do not have capitals. Additionally, there is no national capital on the Black Sea.
The one quasi-exception to this is Sukhumi in Abkhazia, which is an unrecognized independent state.
The capital of the country that borders both the Black Sea and the Mediterranean Sea is Ankara, the capital of Turkey.
No nation's capital city is located on the coast of the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Seas do not have capitals.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.