The Dena is a part of the Zagros mountain range, situated on the boundary of the Isfahan, Kohgiluyeh and Boyer-Ahmad and Chaharmahal and Bakhtiari provinces.
One of the most beautiful natural areas of the province is the Dena protected Zone. It has the privilege of having a vegetation and animal species. This region is mountainous area with high summits, tall faces and deep valleys. In the eastern part of Dena, there is the historical bottleneck of Bijan. The northern, western and southern frontiers of this area are surrounded by the Marir and Besha Rivers.
Dena Mountains forms the axis of several water reserves from rivers in addition to various with lots of springs on the various slopes of these mountains. This vicinity is rich regarding vegetation for therapeutic use and consumption. Some of these trees are Kikom, sand, wild plum and oak trees. The Dena Bird Park is very famous here. Wildlife such as the brown bear, types of eagles, leopards, wolves many species of wild cats, falcons , partridges, etc. can be observed in this protected zone