Answer:
Caucasus Mountains separates Europe from SouthWest Asia.
Step-by-step explanation:
Caucasus is mountain range that streches between Blask Sea and Caspian Sea in west-east direction. This range is politically located in parts of Russia, Georgia, Azerbaijan and Armenia. It's highest point is Elbrus (5,642 m).
Caucasus is natural border between Asia and Europe. To the west border between mentioned continents runs over Black Sea, and in the opposite direction, over Caspian Sea.
Further to the west Europe and Asia are divided by Bosphorus, Sea of Marmara and Dardanelles.