外山川

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外山川 flows into 大川 , which it joins at N 39° 47′ 45″, E 141° 36′ 49″ at OSM node n753368981, and there 121 km of total upstream flows in. load it's distributaries

外山川 has 5 tributaries.

• 青松沢, which joins it at N 39° 45′ 40″, E 141° 34′ 48″ at OSM node n754172722, and 11 km of total upstream flows in.
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• 野津辺沢, which joins it at N 39° 45′ 40″, E 141° 34′ 48″ at OSM node n754172722, and 9 km of total upstream flows in.
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• 浦子内沢, which joins it at N 39° 45′ 56″, E 141° 35′ 7″ at OSM node n754498936, and 4 km of total upstream flows in.
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• 大野沢, which joins it at N 39° 47′ 38″, E 141° 36′ 48″ at OSM node n754600266, and 4 km of total upstream flows in.
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• 小屋池部沢, which joins it at N 39° 47′ 20″, E 141° 36′ 51″ at OSM node n753670207, and 2 km of total upstream flows in.
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