Khojir and Sorkheh hesar national park with an area of 9,380 hectares stand at an attitude of 1,547 m. above sea-level, besides Tehran city. This is one of the oldest protected areas in Iran that is greatly considerable in terms of biodiversity and ecological values. The major portion of this territory is a base for immigrant birds during winter. Access to this park can be gained from the Khojir and Qasr-e-Firoozeh Roads.
Pistachio (Pistacia atlantica Desf.) communities, which create some woodland in this park, are unique because they grow tolerantly in a dry land, in the vicinity of Tehran capital.