There are wonderful caves in Iran. Some of these caves are named here: Namakdan cave which is the longest known salt cave in the world. Ali Sadr cave and Saholan caves are Water flows inside the cave and allows boat-riding inside the cave. Paraw cave one of the deepest cave in the world. Chal-e Nakhjir cave is known for its exceptional white dolomite sediments, covering the floor of major corridors of the cave and Katale Khor cave located near the city of Zanjan. Examples of historical caves of IRAN include the Shekarchyan cave in Kermanshah, Karaftu cave in Kordestan, the caves of Humyan and Kalmakareh in Lorestan.