大洞谷

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大洞谷 flows into 馬瀬川 , which it joins at N 35° 41′ 39″, E 137° 8′ 23″ at OSM node n726273605, and there 362 km of total upstream flows in. load it's distributaries

大洞谷 has 1 tributaries.

• 東洞谷, which joins it at N 35° 42′ 4″, E 137° 8′ 26″ at OSM node n726010265, and 796 m of total upstream flows in.
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