(unnamed)

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(unnamed) flows into 上笹川 , which it joins at the following points: 3 km of total upstream flows in at N 34° 56′ 29″, E 134° 33′ 28″ at OSM node n970402643 7 km of total upstream flows in at N 34° 56′ 10″, E 134° 33′ 24″ at OSM node n970420391 load it's distributaries

(unnamed) has 1 tributaries.

• 宇原谷川, which joins it at N 34° 57′ 15″, E 134° 33′ 0″ at OSM node n970409191, and 3 km of total upstream flows in.
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