古間木川

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古間木川 flows into 姉沼川 , which it joins at N 40° 41′ 19″, E 141° 20′ 24″ at OSM node n753040908, and there 20 km of total upstream flows in. load it's distributaries

古間木川 has 4 tributaries.

• (unnamed), which joins it at N 40° 41′ 19″, E 141° 20′ 25″ at OSM node n753747368, and 938 m of total upstream flows in.
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• (unnamed), which joins it at N 40° 39′ 10″, E 141° 21′ 38″ at OSM node n753849878, and 689 m of total upstream flows in.
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• (unnamed), which joins it at N 40° 41′ 4″, E 141° 20′ 43″ at OSM node n753246349, and 619 m of total upstream flows in.
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• 氷沢川, which joins it at N 40° 39′ 49″, E 141° 21′ 21″ at OSM node n753155360, and 454 m of total upstream flows in.
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