西洞川

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西洞川 flows into 渡来川 , which it joins at N 35° 32′ 11″, E 136° 52′ 18″ at OSM node n726468202, and there 7 km of total upstream flows in. load it's distributaries

西洞川 has 2 tributaries.

• 山の谷, which joins it at N 35° 33′ 0″, E 136° 51′ 36″ at OSM node n726120300, and 1 km of total upstream flows in.
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• 矢ヶ三洞谷川, which joins it at N 35° 32′ 20″, E 136° 52′ 9″ at OSM node n726176801, and 1 km of total upstream flows in.
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