古大内川

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古大内川 flows into 東岳川 , which it joins at N 31° 48′ 23″, E 131° 9′ 58″ at OSM node n743196084, and there 18 km of total upstream flows in. load it's distributaries

古大内川 has 2 tributaries.

• (unnamed), which joins it at N 31° 48′ 18″, E 131° 11′ 2″ at OSM node n742971027, and 902 m of total upstream flows in.
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• (unnamed), which joins it at N 31° 49′ 13″, E 131° 11′ 24″ at OSM node n743114464, and 495 m of total upstream flows in.
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