外川沢

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外川沢 flows into 最上川 , which it joins at N 38° 45′ 10″, E 140° 5′ 6″ at OSM node n755430079, and there 5,388 km of total upstream flows in. load it's distributaries

外川沢 has 2 tributaries.

• 篭山沢, which joins it at N 38° 46′ 38″, E 140° 4′ 15″ at OSM node n755134271, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 38° 46′ 38″, E 140° 4′ 15″ at OSM node n755134271, and 508 m of total upstream flows in.
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