Kulun Lake is a large high-mountainous lake located in the eastern part of the Osh Region in the depth of the Ferghana Mountain Range. It is part of the Kulun-Ata State Reserve.
Kulun is a landslide lake, formed as a result of a powerful earthquake. The total area of the lake is 3 square kilometers. The lake is at a fairly high altitude of 2,800 meters. Below Lake Kulun is Little Kulun, which accumulates water from the main lake.