Сергей

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Сергей flows into (unnamed) , which it joins at N 63° 45′ 16″, E 143° 10′ 45″ at OSM node n6818108139, and there 121 km of total upstream flows in. load it's distributaries

Сергей has 3 tributaries.

• (unnamed), which joins it at N 63° 45′ 27″, E 143° 3′ 24″ at OSM node n11443024537, and 18 km of total upstream flows in.
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• Якутский, which joins it at N 63° 45′ 56″, E 142° 48′ 16″ at OSM node n11443024613, and 16 km of total upstream flows in.
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• Болотный, which joins it at N 63° 45′ 57″, E 142° 52′ 32″ at OSM node n11443024430, and 11 km of total upstream flows in.
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