Katale khor is a cave

Cave

A cave or cavern is a natural underground space large enough for a human to enter. The term applies to natural cavities some part of which is in total darkness. The word cave also includes smaller spaces like rock shelters, sea caves, and grottos.Speleology is the science of exploration and study...

 located in Zanjan Province

Zanjan Province

Zanjan Province is one of the 31 provinces of Iran. Located in the North West of Iran, its capital is Zanjan city. Zanjan province with an area of 36,400 km² has a mostly rural, population of 964,601 . The province lies 330 km northwest of Tehran, connected to it via a freeway.Zanjan...

, Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

. It is situated at 120 km south of Zanjan

Zanjan

Zanjan may refer to:* Zanjan Province, Iran* Zanjan County, an area within Zanjan Province* Zanjan, Iran, the capital of Zanjan County and Zanjan Province* Zanjan University, located in the city of Zanjan* Senjan, a city in Markazi Province, Iran...

 city and 410 km away from Tehran

Tehran

Tehran , sometimes spelled Teheran, is the capital of Iran and Tehran Province. With an estimated population of 8,429,807; it is also Iran's largest urban area and city, one of the largest cities in Western Asia, and is the world's 19th largest city.In the 20th century, Tehran was subject to...

. The name, Katale khor, means "mount of Sun". Geological studies in 1984 showed that the cave formation dates back to the Jurassic period. It is believed that the cave joins to Ali Sadr Cave

Ali Sadr Cave

The Ali Sadr Cave originally called Ali Saad or Ali Saard is the world's largest water cave which attracts millions of visitors every year. It is located about 100 kilometers north of Hamedan, western Iran...

 in Hamadan province

Hamadan Province

Hamedan Province is one of the 31 provinces of Iran. Its center is Hamedan city. The province of Hamedan covers an area of 19,546 km². In the year 1996, Hamedan province had a population of approximately 1.7 million people....

.

This cave was discovered about 90 years ago but it was registered by Ahmad Jamali.