古賀川

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古賀川 flows into 伊万里川 , which it joins at N 33° 16′ 18″, E 129° 53′ 37″ at OSM node n717170610, and there 18 km of total upstream flows in. load it's distributaries

古賀川 has 2 tributaries.

• 都川内川, which joins it at N 33° 15′ 51″, E 129° 54′ 10″ at OSM node n717190512, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 33° 16′ 10″, E 129° 54′ 8″ at OSM node n717197406, and 393 m of total upstream flows in.
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