西洞川

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西洞川 flows into 白川 , which it joins at N 35° 38′ 24″, E 137° 19′ 0″ at OSM node n726120595, and there 119 km of total upstream flows in. load it's distributaries

西洞川 has 4 tributaries.

• (unnamed), which joins it at N 35° 38′ 49″, E 137° 19′ 3″ at OSM node n726227362, and 4 km of total upstream flows in.
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• (unnamed) , which joins it at the following points: 2 km of total upstream flows in at N 35° 39′ 10″, E 137° 18′ 24″ at OSM node n726177429 843 m of total upstream flows in at N 35° 39′ 10″, E 137° 18′ 24″ at OSM node n726177429
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• 中之谷, which joins it at N 35° 39′ 11″, E 137° 18′ 40″ at OSM node n726191096, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 35° 38′ 40″, E 137° 18′ 58″ at OSM node n726250276, and 787 m of total upstream flows in.
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