Köbeytuz, Salt lake in Yereymentau District, Kazakhstan

Köbeytuz is a rounded, drainless salt lake in Yereymentau District, Akmola Region, with a length of 3.5 km, a width of 3.1 km and an area of 6.9 km², lying at 253 m above sea level. Its water has a salinity of 334 g/l and freezes from November to April. The lake sits in the Teniz basin, 3.5 km east of the eastern shore of Lake Teniz.

The name Köbeituz comes from the Kazakh words "kobei" (to multiply) and "tuz" (salt), a reference to the lake's heavy salinity. The lake lies in the Teniz basin, part of the Olenti river drainage, 3.5 km east of the eastern shore of Lake Teniz, at 253 m above sea level. Its water holds 334 g of salt per litre and freezes from November to April.

The name Köbeytuz comes from the Kazakh "kobei" (multiply) and "tuz" (salt). Visitors today come mainly to photograph the water, which turns pink in warm, sunny weather when Dunaliella salina algae release reddish carotenoid pigments; the lake colours only once every few years.

The lake lies northeast of Yereymentau and north of the Korzhynkol station, east of the bitter-salt lake Teniz and Lake Kurbetkol. There are no visitor facilities or infrastructure at the site. The water is very shallow, with a maximum depth of about 20 cm, so you can only wade in knee-deep. For the brightest pink colour, come in sunny weather.

The water occasionally turns pink due to Dunaliella salina algae, which produces carotenoid pigments under specific environmental conditions. This natural transformation occurs intermittently and creates an unusual sight in the landscape.