古川

古川 is 9 km long, and has a stream level of 1.

Map of 古川

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It has 1 side channels.

古川 flows into 筑後川 , which it joins at N 33° 21′ 46″, E 130° 39′ 9″ at OSM node n745371243, and there 1,429 km of total upstream flows in.

古川 has 4 tributaries.

美津留川, which joins it at N 33° 21′ 29″, E 130° 41′ 50″ at OSM node n745392055, and 25 km of total upstream flows in.

(unnamed), which joins it at N 33° 20′ 55″, E 130° 40′ 10″ at OSM node n745514203, and 4 km of total upstream flows in.

(unnamed), which joins it at N 33° 21′ 22″, E 130° 43′ 7″ at OSM node n745516324, and 3 km of total upstream flows in.

(unnamed), which joins it at N 33° 21′ 21″, E 130° 40′ 51″ at OSM node n745582698, and 345 m of total upstream flows in.