This cave is located in the Peraw Mountain (Zagross Mountain Range), to the north of this province. The Peraw Cave is the largest calcareous cave in the world and its structure is related to the third period of geology. Inside the cave there are 26 wells in various depths ranging between 5 to 42 m. The cave opening is a small hole which terminates to small and big areas with various branches and large stones, between which crevices and precipices have been formed. In the month of December, the cave is covered by stalactites and stalagmites which create special beauty. Appropriate security measures and gear are required for descending into the said cave.