1の沢川

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1の沢川 flows into 浦島内川 , which it joins at N 43° 54′ 1″, E 143° 27′ 51″ at OSM node n1476179821, and there 62 km of total upstream flows in. load it's distributaries

1の沢川 has 3 tributaries.

• 兼吉沢川, which joins it at N 43° 54′ 9″, E 143° 27′ 42″ at OSM node n1476182914, and 8 km of total upstream flows in.
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• (unnamed), which joins it at N 43° 54′ 31″, E 143° 27′ 46″ at OSM node n1476188670, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 43° 55′ 18″, E 143° 27′ 58″ at OSM node n1476195353, and 389 m of total upstream flows in.
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