What mountain range is between the black and caspian seas

Caucasus Mountain Range or  Caucasus Mountains is between the black and caspian seas.

Explanation:

This mountain is a great barrier that extends for 750 miles and its tops exceed 4500 meters. It is located between the Black Sea and the Caspian Sea.

It has two mountain ranges: the Great Caucasus, which is the largest mountain range and extends for 1200 km, and the Lesser Caucasus which is 600 km long.

This great mountain range was created by the clash between the Arab plate and the Eurasian plate approximately 28 million years ago. Due to the constant movement of plates, it is a region prone to continuous strong earthquakes although it does not have volcanic activity despite the existence of some stratovolcanoes.