It is situated just south of the Roman site of Jerash and covers an area of 8.5 square kilometres (3.3 sq mi)
of rolling hills covered with pine-oak habitat.
The area was protected as a nature reserve in 2004 under the initiative of the Royal Society for the Conservation of Nature.
The rock within the reserve is a mixture of limestone and chalky limestone,
which has been formed into steep slopes. The average rainfall is 710 millimetres (28 in) per year.
Within the forest, there is a variety of moisture conditions,
with wadis giving different regimes from those found on the steep slopes.
The forest reserve contains one of the last remaining examples of a pine-oak forest in the Middle East.
The species of the reserve’s trees vary with elevation; Aleppo Pines inhabit the lower altitudes,
the mixed pine-oak woodland (comprising Aleppo Pine and Palestine Oak) grows in the middle,
and a species of small deciduous oak – Quercus infectoria (the Aleppo, or Cyprus, Oak) – grows at the higher altitudes.
Other plants in the habitat include orchids, Greek strawberry trees, pistachio, and olive trees.
The forest’s age structure shows wide variation, with many areas containing mature forest trees and a vigorous understory.