Caucus Mountains

I think you might be referring to the "Caucasus Mountains", not "Caucus Mountains". The Caucasus Mountains are a mountain system in West Asia between the Black Sea and the Caspian Sea. It is considered a boundary between Eastern Europe and Western Asia. The Caucasus region is home to several ethnic groups and is known for its linguistic diversity. The highest peak in the Caucasus Mountains is Mount Elbrus, which is also the highest peak in Europe.