This narrow and high valley is one of the most important and strategic points of the region, located in the western side of the Dareh Shahr - Pol Dokhtar road.
This gorge, which is also called the Bahram Hunting Ground, contains several historical monuments in its entrance and on the hard rocks like the ruins of a Sassanide castle which is built of stone and gypsum with stone stairs and four connected water reservoirs (Ab anbar) which are worth seeing.
Reference: www.wikipedia.org
