Сума

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Сума flows into Систа , which it joins at N 59° 38′ 23″, E 28° 46′ 32″ at OSM node n244320475, and there 193 km of total upstream flows in. load it's distributaries

Сума has 2 tributaries.

• (unnamed), which joins it at N 59° 31′ 18″, E 28° 52′ 18″ at OSM node n2420460594, and 28 km of total upstream flows in.
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• (unnamed), which joins it at N 59° 37′ 45″, E 28° 43′ 58″ at OSM node n248633779, and 2 km of total upstream flows in.
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