(unnamed)

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(unnamed) flows into the sea: 2 km flows in at N 36° 44′ 37″, E 136° 59′ 28″ at OSM node n720751564. 2 km flows in at N 36° 45′ 34″, E 137° 0′ 5″ at OSM node n720751899. 1 km flows in at N 36° 46′ 6″, E 136° 59′ 52″ at OSM node n720752262. (unnamed) has 3 distributaries.

• 小矢部川 , which it joins at N 36° 46′ 5″, E 136° 59′ 35″ at OSM node n9012839948, and 601 km of total upstream flows in. load it's distributaries
• 千保川 , which it joins at N 36° 45′ 46″, E 137° 0′ 35″ at OSM node n720752542, and 35 km of total upstream flows in. load it's distributaries
• 祖父川 , which it joins at N 36° 43′ 52″, E 136° 58′ 24″ at OSM node n720738123, and 14 km of total upstream flows in. load it's distributaries

(unnamed) has 1 tributaries.

• 五十玉用水, which joins it at N 36° 43′ 47″, E 136° 59′ 2″ at OSM node n720738883, and 6 km of total upstream flows in.
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