大洞川

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大洞川 flows into 小坂川 , which it joins at N 35° 55′ 32″, E 137° 18′ 27″ at OSM node n725935148, and there 172 km of total upstream flows in. load it's distributaries

大洞川 has 3 tributaries.

• 鹿山筋谷, which joins it at N 35° 53′ 34″, E 137° 18′ 59″ at OSM node n726100243, and 22 km of total upstream flows in.
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• 若栃谷, which joins it at N 35° 53′ 34″, E 137° 18′ 59″ at OSM node n726100243, and 19 km of total upstream flows in.
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• 葛谷, which joins it at N 35° 53′ 52″, E 137° 19′ 1″ at OSM node n726192423, and 4 km of total upstream flows in.
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