長根沢

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長根沢 flows into 相内川 , which it joins at N 41° 3′ 20″, E 140° 23′ 56″ at OSM node n753707634, and there 24 km of total upstream flows in. load it's distributaries

長根沢 has 2 tributaries.

• (unnamed), which joins it at N 41° 3′ 39″, E 140° 24′ 12″ at OSM node n753727641, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 41° 3′ 44″, E 140° 24′ 10″ at OSM node n753716904, and 974 m of total upstream flows in.
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