西洞川

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西洞川 flows into 黒川 , which it joins at N 35° 52′ 53″, E 137° 40′ 26″ at OSM node n748224034, and there 31 km of total upstream flows in. load it's distributaries

西洞川 has 2 tributaries.

• (unnamed), which joins it at N 35° 54′ 41″, E 137° 39′ 18″ at OSM node n748645633, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 35° 53′ 49″, E 137° 39′ 32″ at OSM node n748100014, and 1 km of total upstream flows in.
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