古川

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古川 flows into 雄物川 , which it joins at N 39° 39′ 46″, E 140° 7′ 0″ at OSM node n5568892529, and there 4,093 km of total upstream flows in. load it's distributaries

古川 has 5 tributaries.

• (unnamed), which joins it at N 39° 40′ 26″, E 140° 9′ 4″ at OSM node n755109457, and 6 km of total upstream flows in.
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• (unnamed), which joins it at N 39° 39′ 58″, E 140° 7′ 24″ at OSM node n755739152, and 4 km of total upstream flows in.
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• (unnamed) , which joins it at the following points: 696 m of total upstream flows in at N 39° 39′ 56″, E 140° 7′ 22″ at OSM node n755146722 860 m of total upstream flows in at N 39° 39′ 52″, E 140° 7′ 13″ at OSM node n5568892526
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• (unnamed), which joins it at N 39° 40′ 18″, E 140° 7′ 45″ at OSM node n7673266351, and 582 m of total upstream flows in.
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• (unnamed), which joins it at N 39° 40′ 7″, E 140° 7′ 37″ at OSM node n7673308092, and 528 m of total upstream flows in.
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