Khanate of Sibir
Qashliq, Isker or Sibir (Siberian Tatar language: "Sibir", "Qaşliq" or "Esker") was a medieval (14th–16th century) Siberian Tatar fortress, in the 16th century the capital of the Khanate of Sibir, located on the right bank of the Irtysh River at its confluence with the "Sibirka" rivulet, some 17 km from the modern city of Tobolsk.