(unnamed)

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(unnamed) flows into the sea: 3 km flows in at N 36° 38′ 31″, E 137° 1′ 47″ at OSM node n5263344684. 1 km flows in at N 36° 37′ 0″, E 137° 0′ 30″ at OSM node n5421574535. (unnamed) has 2 distributaries.

• 庄川 , which it joins at N 36° 37′ 29″, E 137° 0′ 6″ at OSM node n720730460, and 760 km of total upstream flows in. load it's distributaries
• 親司川 , which it joins at N 36° 42′ 41″, E 137° 1′ 34″ at OSM node n5304445596, and 9 km of total upstream flows in. load it's distributaries

(unnamed) has 0 tributaries.