Kurbankul (Blue Lake) is the main natural attraction of the Shahimardan exclave of the Republic of Uzbekistan. Located 7 kilometers southwest of the village of Shahimardan. The water in the lake is turquoise. A holy place for Muslims. The lake arose after a series of powerful earthquakes in 1766. Located at an altitude of 1724 m above sea level. The lake is 170 meters long, 60 meters wide, and 5-10 meters deep. Water temperature reaches 5-10 degrees Celsius in summer. Since its inception, the lake has become a pilgrimage site for Muslims in the Ferghana Valley.

It is believed that if you went up to this sacred lake, tied a rag to a tree, then you left your illnesses here.