古川

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古川 flows into (unnamed) , which it joins at N 33° 58′ 24″, E 136° 9′ 57″ at OSM node n734671837, and there 14 km of total upstream flows in. load it's distributaries

古川 has 4 tributaries.

• 平谷川, which joins it at N 33° 58′ 17″, E 136° 9′ 53″ at OSM node n734327411, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 33° 59′ 13″, E 136° 9′ 29″ at OSM node n734446606, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 33° 59′ 25″, E 136° 9′ 6″ at OSM node n734496424, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 33° 58′ 39″, E 136° 9′ 38″ at OSM node n734571858, and 1 km of total upstream flows in.
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