洞岩谷

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洞岩谷 flows into 二之瀬川 , which it joins at N 35° 12′ 12″, E 136° 31′ 38″ at OSM node n734608955, and there 13 km of total upstream flows in. load it's distributaries

洞岩谷 has 2 tributaries.

• 御弁当谷川, which joins it at N 35° 12′ 14″, E 136° 31′ 47″ at OSM node n734260040, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 35° 12′ 44″, E 136° 32′ 13″ at OSM node n734607355, and 1 km of total upstream flows in.
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