Первый

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Первый flows into (unnamed) , which it joins at N 45° 4′ 6″, E 136° 40′ 23″ at OSM node n6059470045, and there 62 km of total upstream flows in. load it's distributaries

Первый has 3 tributaries.

• (unnamed), which joins it at N 45° 7′ 42″, E 136° 39′ 23″ at OSM node n6059470091, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 45° 6′ 56″, E 136° 39′ 23″ at OSM node n6059470139, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 45° 8′ 28″, E 136° 39′ 42″ at OSM node n6059470104, and 724 m of total upstream flows in.
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