The Black River is in the United States, it runs through no other countries.
Canada
Russia
Venezuela
Romania.
SPAIN !
India and Bangladesh
The River Thames runs through one country; England.
The United States and Mexico.
The United States and Mexico.
The river Severn flows through England and wales
I find no mention of a river named Mediterranean River" anywhere on the Internet There are many rivers, running through many countries, around the Mediterranean Sea.