Dena is the name for a sub-range within the Zagros Mountains, Iran. Mount Dena, with 80 km length and 15 km average width, is situated on the boundary of the Isfahan, Kohgiluyeh and Boyer-Ahmad and Chaharmahal and Bakhtiari Provinces of Iran. Mount Dena has more than 40 peaks higher than 4,000 metres. Annual precipitation in Mount Dena ranges from 600 to 1,800 mm.