(unnamed)

(unnamed) is 2 km long, and has a stream level of 2.

Map of (unnamed)

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(unnamed) flows into 小阿仁川 , which it joins at N 39° 55′ 12″, E 140° 18′ 29″ at OSM node n755557883, and there 59 km of total upstream flows in.

(unnamed) has 3 tributaries.

赤沢, which joins it at N 39° 54′ 46″, E 140° 19′ 21″ at OSM node n755110570, and 4 km of total upstream flows in.

岩戸金山沢, which joins it at N 39° 54′ 46″, E 140° 19′ 21″ at OSM node n755110570, and 2 km of total upstream flows in.

大倉又沢, which joins it at N 39° 54′ 53″, E 140° 19′ 5″ at OSM node n755030052, and 2 km of total upstream flows in.