The largest lake in the Low­er Amur flood­plain. Its area is 338 square kilo­me­ters, length 58 kilo­me­ters, max­i­mum width 23 kilo­me­ters, max­i­mum depth up to 4 meters. 51 rivers flow into the lake, the largest rivers are Sim­mi and Kharpi. The Siy Riv­er flows out, con­nect­ing the lake with the Amur. Area: 323,60001 sq. km., vol­ume: 4030,05 cubic meters, depth avg: 12,5 m, shore length: 148,83 m, res time: 191,2, ele­va­tion: 16