The drainage basin area is 3200 km². The vol­ume of the reser­voir is approx­i­mate­ly 2 km³. The water sur­face area of the reser­voir is more than 37 km², the length of the coast­line is about one hun­dred kilo­me­ters. The reser­voir lev­el drops sig­nif­i­cant­ly in the sum­mer, as its water is used for irri­ga­tion and irri­gat­ed agri­cul­ture in the Chirchik val­ley.