(unnamed)

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(unnamed) flows into 島井川 , which it joins at N 35° 32′ 19″, E 134° 32′ 57″ at OSM node n970475819, and there 6 km of total upstream flows in. load it's distributaries

(unnamed) has 3 tributaries.

• コワ川, which joins it at N 35° 32′ 20″, E 134° 32′ 36″ at OSM node n970320063, and 1 km of total upstream flows in.
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• 坂根川, which joins it at N 35° 32′ 22″, E 134° 32′ 35″ at OSM node n970567080, and 605 m of total upstream flows in.
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• 谷山川, which joins it at N 35° 32′ 22″, E 134° 32′ 35″ at OSM node n970567080, and 323 m of total upstream flows in.
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