[5] Rudnichnoye is an endorheic lake lying in the Kazakh Uplands, about 20 kilometers (12 mi) to the north of the northern slopes of the Ayr Mountains.

It consists of a larger western lake and a smaller eastern one, separated by a double landspit and a peninsula, and connected by a sound.

The highest level of the lake is in April, following the melting of the snow, and the lowest after the summer, in September.

Smaller lake Kandykol lies 10 kilometers (6.2 mi) to the WNW, and Saumalkol almost 30 kilometers (19 mi) to the SW. 1,049 meters (3,442 ft) high mount Semizbughy rises to the south, above the southern shore of the lake.

[3][1] The lake has few aquatic plants; the main fish species in its waters are perch, pike, karabalik and carp.