古江川

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古江川 flows into the sea: 6 km flows in at N 32° 42′ 18″, E 131° 49′ 20″ at OSM node n743652124.

古江川 has 2 tributaries.

• (unnamed), which joins it at N 32° 42′ 43″, E 131° 49′ 20″ at OSM node n742889310, and 2 km of total upstream flows in.
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• 谷光川, which joins it at N 32° 43′ 38″, E 131° 49′ 35″ at OSM node n742952614, and 1 km of total upstream flows in.
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