西洞川

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西洞川 flows into 津保川 , which it joins at N 35° 32′ 31″, E 136° 59′ 23″ at OSM node n726458587, and there 143 km of total upstream flows in. load it's distributaries

西洞川 has 2 tributaries.

• (unnamed) , which joins it at the following points: 2 km of total upstream flows in at N 35° 33′ 22″, E 136° 58′ 34″ at OSM node n726369968 2 km of total upstream flows in at N 35° 33′ 22″, E 136° 58′ 34″ at OSM node n726369968
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• 大ハサコ谷, which joins it at N 35° 33′ 10″, E 136° 58′ 55″ at OSM node n726291237, and 539 m of total upstream flows in.
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