Located on the southern slopes of central Alborz
mountains adjacent to Tehran. This 26907 ha area
has been protected since 1982. The altitude range
of 1700-3900 m, and mean annual precipitation
and temperature of 700 mm and 5°C, respectively
have resulted in warm Mediterranean and
temperate sub-humid climates. The exceptionally
high animal and plant biodiversity of the area is
a characteristic feature of the region. 577 plant
and 162 animal species have been identified in
Varjin. Some of the main plant species are juniper,
willow, ash tree, almond, oxytropis, thyme, rhubarb,
mullein, borage, prickly thrift, and different species
of Gramineae. The main animal species of the
region include Alborz red sheep, wild goat, leopard,
wild boar, hyena, chukar partridge, Caspian
snowcock, tawny eagle, transcaucasian meadow
viper, Latifi's viper, brook trout, and lenkoran. The
region plays an important role as a corridor
for the animals-especially wild sheep-between
central Alborz and Lar national park. Interesting
habitat characteristics and high biodiversity of the
region have provided researches with a natural
laboratory. Numerous springs, diverse vegetation
cover, novel landscapes and adjacency with
Tehran, have resulted in the attraction of tourists
far more than what the area can sustain. This has
resulted in high pollution of the Jajrud river,
considerable land use conversion, and
uncontrolled construction and population growth in the region.