古城川

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古城川 flows into 八重川 , which it joins at N 31° 53′ 13″, E 131° 24′ 34″ at OSM node n742698008, and there 19 km of total upstream flows in. load it's distributaries

古城川 has 4 tributaries.

• 北川内川, which joins it at N 31° 53′ 27″, E 131° 23′ 43″ at OSM node n742707121, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 31° 53′ 34″, E 131° 23′ 6″ at OSM node n743136850, and 545 m of total upstream flows in.
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• (unnamed), which joins it at N 31° 53′ 33″, E 131° 23′ 38″ at OSM node n743232338, and 468 m of total upstream flows in.
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• (unnamed), which joins it at N 31° 53′ 14″, E 131° 21′ 54″ at OSM node n739555391, and 292 m of total upstream flows in.
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