長洞谷

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長洞谷 flows into 馬瀬川 , which it joins at N 35° 39′ 42″, E 137° 9′ 38″ at OSM node n725971722, and there 390 km of total upstream flows in. load it's distributaries

長洞谷 has 3 tributaries.

• (unnamed), which joins it at N 35° 39′ 6″, E 137° 8′ 39″ at OSM node n726287030, and 747 m of total upstream flows in.
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• 寺尾谷, which joins it at N 35° 39′ 7″, E 137° 8′ 44″ at OSM node n726400248, and 613 m of total upstream flows in.
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• 桂洞谷, which joins it at N 35° 39′ 7″, E 137° 8′ 44″ at OSM node n726160565, and 375 m of total upstream flows in.
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