(unnamed)

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(unnamed) flows into the sea: 3 km flows in at N 33° 20′ 45″, E 130° 40′ 13″ at OSM node n745521568. 1 km flows in at N 33° 21′ 9″, E 130° 41′ 14″ at OSM node n745391321. (unnamed) has 2 distributaries.

• 巨瀬川 , which it joins at N 33° 20′ 25″, E 130° 41′ 10″ at OSM node n745558571, and 53 km of total upstream flows in. load it's distributaries
• 古川 , which it joins at N 33° 20′ 55″, E 130° 40′ 10″ at OSM node n745514203, and 36 km of total upstream flows in. load it's distributaries

(unnamed) has 0 tributaries.