古川

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古川 flows into 旧北上川 , which it joins at N 38° 29′ 34″, E 141° 17′ 30″ at OSM node n754585472, and there 1,587 km of total upstream flows in. load it's distributaries

古川 has 4 tributaries.

• (unnamed) , which joins it at the following points: 10 km of total upstream flows in at N 38° 33′ 38″, E 141° 16′ 5″ at OSM node n754673498 13 km of total upstream flows in at N 38° 31′ 16″, E 141° 15′ 25″ at OSM node n8686483862
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• (unnamed) , which joins it at the following points: 5 km of total upstream flows in at N 38° 29′ 49″, E 141° 17′ 4″ at OSM node n754786387 3 km of total upstream flows in at N 38° 29′ 39″, E 141° 17′ 15″ at OSM node n754854613 3 km of total upstream flows in at N 38° 29′ 35″, E 141° 17′ 18″ at OSM node n10706499158
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• (unnamed), which joins it at N 38° 32′ 51″, E 141° 15′ 9″ at OSM node n754754427, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 38° 32′ 52″, E 141° 15′ 10″ at OSM node n10801550242, and 1 km of total upstream flows in.
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