Which one of the following mountains lies in between Caspian Sea and Black Sea?

The Caucasus Mountains are a major mountain system located at the intersection of Europe and Asia, stretching approximately 1,100 kilometers between the Black Sea in the west and the Caspian Sea in the east [2]. This range includes the Greater Caucasus in the north and the Lesser Caucasus in the south, serving as a natural boundary between the two continents [4]. In contrast, the Elburz (Alborz) Mountains are located in northern Iran, running along the southern coast of the Caspian Sea rather than between the two seas [1][3]. The Carpathians are situated in Central and Eastern Europe, while the Apennines form the backbone of the Italian peninsula. The Caucasus region spans several countries, including Russia, Georgia, Azerbaijan, and Armenia, and contains Mount Elbrus, the highest peak in Europe [2].

Sources

1. [2] https://en.wikipedia.org/wiki/Caucasus_Mountains
2. [4] https://www.britannica.com/place/Caucasus
3. [1] https://en.wikipedia.org/wiki/Alborz
4. [3] https://www.science.gov/topicpages/m/mountains+northern+iran.html