外山沢

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外山沢 flows into 小友川 , which it joins at N 39° 16′ 47″, E 141° 23′ 34″ at OSM node n753582483, and there 74 km of total upstream flows in. load it's distributaries

外山沢 has 2 tributaries.

• 角出沢, which joins it at N 39° 15′ 53″, E 141° 22′ 59″ at OSM node n754336503, and 3 km of total upstream flows in.
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• 沢内沢, which joins it at N 39° 16′ 1″, E 141° 23′ 2″ at OSM node n754499433, and 1 km of total upstream flows in.
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