The Turgai River (also Torgai or Turgay) (Russian: Тургай) is a river that flows in the Turgai Valley in Kazakhstan.
The river is 825 km long, the surface of the drainage basin is 157,000 km². Average water consumption is around 9 cubic meters/second. The Turgai disappears in the endorheic basin of Shalkarteniz.
The valley occupies an erosion-tectonic basin in north-western Kazakhstan, between the Urals and Mugodzhar Hills in the west and the Kazakh Steppes in the east. In the north are dry steppes with semi-steppes in the south. Deposits of iron ore and other minerals occur in the basin.
The Turgai Plateau crosses from south to north. The Thurgau Ubahan (tributary of the Tobol) along with all the rivers of in the Turgai valley have many lakes. This is where the Naurzumskyy reserve is located which connects the West Siberian Plain in the northern part of Kazakhstan Turan lowland.
Coordinates: 48°01′14″N 63°01′55″E / 48.02056°N 63.03194°E