(unnamed)

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

Map of (unnamed)

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(unnamed) flows into 外洞川 , which it joins at N 35° 33′ 31″, E 137° 31′ 22″ at OSM node n725934296, and there 10 km of total upstream flows in.

(unnamed) has 1 tributaries.

下明ヶ沢, which joins it at N 35° 33′ 19″, E 137° 30′ 55″ at OSM node n726224259, and 1 km of total upstream flows in.