(unnamed)

(unnamed) is 3 km long, and has a stream level of 2.

Map of (unnamed)

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(unnamed) flows into 上野原沢 , which it joins at N 36° 40′ 36″, E 139° 0′ 20″ at OSM node n759298073, and there 8 km of total upstream flows in.

(unnamed) has 2 tributaries.

十二前沢, which joins it at N 36° 40′ 44″, E 139° 0′ 12″ at OSM node n760044135, and 1 km of total upstream flows in.

薬研堀沢, which joins it at N 36° 41′ 23″, E 139° 0′ 26″ at OSM node n759654929, and 856 m of total upstream flows in.