Strait of Razyaneh
The Razyaneh Strait is located at 75 km in the south of the Ilām region near the village of Chanārbāshi. It is a narrow and deep lush canyon in which flows a river that originates from the Sarāb Garm spring and its walls, which are between 15 and 30 meters in height, are made of limestone with a carbonate compound of football. This strait has been called Razyaneh from the name of the wild fennel (dill) that grows nearby. Its width in some places is also reduced by half a meter and this, together with the flow of water inside, has meant that no animal can live in this place. In reality it has two ecosystems, an internal one with semi-aquatic plants and an external one which, thanks to the proximity to the desert mountain range, is rich in a great variety of plants so that 75 hectares of land of this strait have been considered natural heritage -national.