Bol'shoy Uvat

Bolshoy Uvat belongs to the lake country of the middle Irtysh, with Qashliq as its nearest historic regional focus. The fortress stood on the right bank of the Irtysh at the Sibirka rivulet, about seventeen kilometres from later Tobolsk. From the fourteenth to the sixteenth century it was a Siberian Tatar stronghold, and in the sixteenth century it became the capital of the Khanate of Sibir. Its most developed period came in the first half of that century.

Cossacks under ataman Yermak seized and ruined Qashliq in 1582. Siberian Tatars retook the ruined city in 1584, but it was lost permanently in 1586. The site declined while Tobolsk arose nearby in 1587, replacing the former capital as a centre of power. Accounts disagree slightly about Qashliq's precise distance from Tobolsk, though most place it at seventeen or eighteen kilometres. These events frame a wider region where lakes, the Irtysh and an older fortress history overlap.

After Qashliq's destruction, the nearby rise of Tobolsk reoriented routes around a new centre. The older fortress remains important because it marks the sixteenth-century capital of Sibir and a contested point between Siberian Tatar rule and Cossack expansion. Its tributary position also made the Irtysh route more significant than the isolated ruins themselves.