(unnamed)

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(unnamed) flows into the sea: 2 km flows in at N 38° 26′ 50″, E 141° 16′ 27″ at OSM node n5433795493. 2 km flows in at N 38° 27′ 58″, E 141° 16′ 20″ at OSM node n754661768. 665 m flows in at N 38° 27′ 58″, E 141° 16′ 20″ at OSM node n754661768. (unnamed) has 2 distributaries.

• 旧北上川 , which it joins at the following points: 1,614 km of total upstream flows in at N 38° 27′ 3″, E 141° 17′ 19″ at OSM node n754598909. 1,610 km of total upstream flows in at N 38° 27′ 25″, E 141° 17′ 25″ at OSM node n755018663. load it's distributaries
• 北北上運河 , which it joins at N 38° 26′ 31″, E 141° 17′ 16″ at OSM node n754633931, and 5 km of total upstream flows in. load it's distributaries

(unnamed) has 0 tributaries.