Katale Khor cave is located in Zanjan Province, Iran, at 120 km south of Zanjan city and 410 km away from Tehran. The name, Katale khor, means “mountian of Sun”. This cave was discovered about 90 years ago. In 1984 the cave formation was evaluated by Geological studies that dated the cave back to the Jurassic period (about 120 million years ago). It is believed that the cave connects to Ali Sadr Cave in Hamadan province.