下岩戸川

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下岩戸川 flows into 黒羽尻川 , which it joins at N 42° 0′ 8″, E 140° 52′ 33″ at OSM node n1452596648, and there 20 km of total upstream flows in. load it's distributaries

下岩戸川 has 2 tributaries.

• 上岩戸川, which joins it at N 41° 59′ 49″, E 140° 52′ 35″ at OSM node n1452593303, and 4 km of total upstream flows in.
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• (unnamed), which joins it at N 41° 59′ 12″, E 140° 52′ 18″ at OSM node n1452585750, and 458 m of total upstream flows in.
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