１の沢川

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１の沢川 flows into 佐幌川 , which it joins at N 43° 12′ 11″, E 142° 48′ 52″ at OSM node n1462417847, and there 70 km of total upstream flows in. load it's distributaries

１の沢川 has 2 tributaries.

• (unnamed), which joins it at N 43° 15′ 20″, E 142° 47′ 59″ at OSM node n1462444991, and 4 km of total upstream flows in.
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• シナノ沢川, which joins it at N 43° 15′ 49″, E 142° 47′ 6″ at OSM node n1462449549, and 3 km of total upstream flows in.
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