杉洞川

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杉洞川 flows into 内津川 , which it joins at N 35° 19′ 10″, E 137° 2′ 55″ at OSM node n727077949, and there 9 km of total upstream flows in. load it's distributaries

杉洞川 has 2 tributaries.

• (unnamed), which joins it at N 35° 18′ 57″, E 137° 3′ 14″ at OSM node n727106349, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 35° 19′ 3″, E 137° 3′ 8″ at OSM node n727043808, and 303 m of total upstream flows in.
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