Bol'shoy Yugan

The Bolshoy Yugan rises in the Vasyugan bogs and crosses the West Siberian Plain to join the Yuganskaya Ob, a channel of the Ob River. More than a thousand kilometres long, it drains a basin dotted with thousands of small lakes. Its winding course passes through forest and marsh, and its name distinguishes it from the smaller Maly Yugan. The river usually freezes in autumn and opens again in spring.