岩井川

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岩井川 flows into 碓氷川 , which it joins at N 36° 20′ 0″, E 138° 56′ 11″ at OSM node n3729200133, and there 287 km of total upstream flows in. load it's distributaries

岩井川 has 2 tributaries.

• 水境川, which joins it at N 36° 19′ 9″, E 138° 55′ 41″ at OSM node n760043898, and 3 km of total upstream flows in.
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• 倉品川, which joins it at N 36° 19′ 51″, E 138° 55′ 51″ at OSM node n760057167, and 2 km of total upstream flows in.
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