外山沢

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外山沢 flows into 鎖川 , which it joins at N 36° 7′ 20″, E 137° 52′ 13″ at OSM node n748507542, and there 50 km of total upstream flows in. load it's distributaries

外山沢 has 2 tributaries.

• 中俣沢, which joins it at N 36° 5′ 34″, E 137° 51′ 20″ at OSM node n747972654, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 36° 5′ 34″, E 137° 51′ 20″ at OSM node n747972654, and 242 m of total upstream flows in.
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