古川

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古川 flows into 一ツ瀬川 , which it joins at N 32° 3′ 59″, E 131° 25′ 23″ at OSM node n743864895, and there 441 km of total upstream flows in. load it's distributaries

古川 has 2 tributaries.

• (unnamed), which joins it at N 32° 4′ 29″, E 131° 24′ 42″ at OSM node n743539725, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 32° 4′ 8″, E 131° 24′ 53″ at OSM node n743580711, and 2 km of total upstream flows in.
load it's tributaries