Elkül lake, Natural monument and lake in Russia.

Elkül Lake is a freshwater lake in Russia situated at an elevation of around 136 meters (446 feet). The shoreline is ringed by natural vegetation that shapes the landscape of the region.

Elkül is a karst sinkhole lake in the upper reaches of the Al River, 90 m from its left bank in Yantikovsky District, Chuvashia. It is a regional nature monument. Its name is linked by V. D. Dmitriev to Elter, founder of the village of Aldiarovo, a name close to the Bulgar title elteber.

The lake was revered by the southern Anat yenchi group of Chuvash, who knew it as El kül. On the northern slope of the hill stood a kiremet grove with the "Grey Oak of Al Lake"; after spring fieldwork, people from dozens of villages gathered there to sacrifice white bulls, horses and other animals for good weather and harvests. Chuvash settlers in Orenburg, Samara and Ufa provinces addressed the lake's spirits in their prayers.

The lake can be found using coordinates 55.603333 latitude and 47.729167 longitude for navigation. Access routes change depending on the season and weather conditions.

In Chuvash myth, twelve-horned bulls, golden twelve-antlered deer and white urkham horses were said to graze the meadows along the Al river on moonlit nights. Chuvash who migrated to the Orenburg, Samara and Ufa provinces still addressed the lake's spirits in their prayers.