大洞川

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大洞川 flows into 水野川 , which it joins at N 35° 15′ 10″, E 137° 7′ 53″ at OSM node n727056470, and there 20 km of total upstream flows in. load it's distributaries

大洞川 has 1 tributaries.

• (unnamed), which joins it at N 35° 14′ 57″, E 137° 8′ 15″ at OSM node n727008151, and 27 m of total upstream flows in.
load it's tributaries