The Sahvalan cave is located in the village of the same name, near the city of Mahābād (western Azerbāijān region). Although the date of discovery of the cave, which is a collection of some large lakes connected by corridors of water, dates back to around 150 years ago, however the remains found of it are related to the second millennium BC. C.
"Sahvalān" in Kurd means "glacial" but the locals also call it "pigeon's nest" because inside there are many nests of these birds. The height of the ceiling of the cave of Sahvalān made of water-earth-limestone-stone up to the level of its lake is of 50 meters and the depth of the water in some points reaches the 30 meters.
The difference between internal and external temperature fluctuates between 10 and 15 degrees. This cave, with an area of approximately 2 hectares, with an environment the size of 58 meters x 42, has a water path discovered so far along 300 meters and a dry path of 250 meters.
To access it there are two entrance doors, both connected to each other. To reach the depth of 30 meters, it is necessary to descend beyond 100 winding steps to be able to wander around the cave with boats.
The limestone here has created unusual shapes like the bat, the mermaid, the turtle, the octopus etc .. At night you can hear the appalling screams of the bats that live in this cave.