是安川

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是安川 flows into 吉永川 , which it joins at N 35° 42′ 51″, E 135° 6′ 47″ at OSM node n969097830, and there 14 km of total upstream flows in. load it's distributaries

是安川 has 1 tributaries.

• (unnamed), which joins it at N 35° 42′ 6″, E 135° 7′ 20″ at OSM node n968971344, and 2 km of total upstream flows in.
  load it's tributaries