洞山川

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洞山川 flows into 白川 , which it joins at N 35° 36′ 43″, E 137° 15′ 5″ at OSM node n725999840, and there 149 km of total upstream flows in. load it's distributaries

洞山川 has 1 tributaries.

• (unnamed), which joins it at N 35° 37′ 0″, E 137° 14′ 58″ at OSM node n726060089, and 274 m of total upstream flows in.
load it's tributaries