Bolshoy Yugan is a river in Russia, it flows through the territory of Surgutsky and Nefteyugansky Districts of Khanty-Mansi Autonomous Okrug, it is a left tributary of the Ob River, it flows into the Yuganskaya Ob. The length of the river is 1,063-kilometre , its basin area is 34,700-square-kilometre . The average annual water consumption at 118-kilometre from the mouth of the river is 177.67-cubic-metre-per-second . Its source is in the Vasyugan Swamp, it flows through the wetlands of the West Siberian Plain. It has many tributaries, the largest of which is the right Small Yugan. There are about 8,000 lakes in the basin, their total area is 545-square-kilometre . The river is snow fed. It stays frozen from October to early May. Major settlements from the mouth to the source: Yugan, Maloyugansky, Ugut, Kogonchiny, Kayukovy, Taurova, Taylakovo, Larlomkiny.
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