(unnamed)

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

Map of (unnamed)

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(unnamed) flows into 立谷沢川 , which it joins at N 38° 37′ 25″, E 140° 2′ 45″ at OSM node n755584109, and there 70 km of total upstream flows in.

(unnamed) has 2 tributaries.

赤沢川, which joins it at N 38° 37′ 49″, E 140° 3′ 34″ at OSM node n755250169, and 17 km of total upstream flows in.

小砂子沢, which joins it at N 38° 37′ 49″, E 140° 3′ 34″ at OSM node n755250169, and 7 km of total upstream flows in.