Question

which mountains separate european russia from asian russia? caucasus zagros ural lena

Explanation:

The Ural Mountains are a mountain range that runs approximately from north to south through western Russia. They have long been considered the traditional boundary between Europe and Asia. The Caucasus Mountains are located between the Black Sea and the Caspian Sea, mainly in the region of Transcaucasia (countries like Georgia, Armenia, Azerbaijan). The Zagros Mountains are in Iran. The Lena is a river in Russia, not a mountain range.

Answer:

Ural