About Dena : Dena is Persian name and is the name for a sub-range within the Zagros Mountains. 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 4000 meters. With an elevation of 4,409 meters above sea level, Qash-Mastan is the highest peak in the Dena Range and in the Zagros Mountains in general. Another famous peak in this range is Hose-Daal close to the city of Sisakht, 30 km to the north of Yasuj. Annual precipitation in Mount Dena ranges from 600 to 1800 mm and various rivers including a branch of the Karun rise in this range. Elevation : 4409 m Best months to climb : January, February, March, April, May, June, July, August, September, October, November, December Convenient center : Yasouj