Siverga

Siverga (Сиверга; Сиверга, is a salt lake in Kyzylzhar District, North Kazakhstan Region, Kazakhstan and Berdyuzhye and Kazan districts of Tyumen Oblast, Russian Federation.

The lake is located 45 km to the southeast of Berdyuzhye and 32 km to the southwest of Kazanskoye, the district capitals in Russia, and 43 km to the NNW of Petropavl city, the regional capital in Kazakhstan. Polovinnoye village lies 1.5 km to the west of the western shore and Novoalexandrovka 1 km to the southeast of the eastern shore. Siverga is located at the Kazakhstan–Russia border, with most of the lake in Russia and only a small sector of the southern end in Kazakhstan.

Geography
Siverga is an endorheic lake belonging to the Ishim River basin. It is located in an area dotted with small lakes at the southern edge of the Ishim Plain, part of the West Siberian Plain. The lake has an elongated capital letter "E" shape, stretching from north to south for almost 12 km. It has two bays opening to the northeastern and southeastern ends respectively. There is also a bay in the center of the eastern shore with an attached small circular lake.

Lake Akush is located 8 km to the southeast, also on the border, and Tavolzhan 60 km to the east. Lake Stanovoye lies in Kazakhstan, 67 km to the SSW and Medvezhye in Russia, 43 km to the WSW.

Fauna
The lake is a 7500 ha important bird area, providing a habitat for a number of migratory bird species, including the nesting of the pallid harrier and the northern pintail. The Dalmatian pelican has also been reported at the lake. In the Russian Federation Siverga is also an officially protected area.