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

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.

The lake has an elongated capital letter "E" shape, stretching from north to south for almost 12 kilometers (7.5 mi).

There is also a bay in the center of the eastern shore with an attached small circular lake.

[2][1] The lake is a 7,500 hectares (19,000 acres) important bird area, providing a habitat for a number of migratory bird species, including the nesting of the pallid harrier and the northern pintail.