古佐内川

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古佐内川 flows into 厚沢部川 , which it joins at N 41° 53′ 44″, E 140° 16′ 21″ at OSM node n1452512484, and there 263 km of total upstream flows in. load it's distributaries

古佐内川 has 2 tributaries.

• 右股沢, which joins it at N 41° 52′ 9″, E 140° 15′ 28″ at OSM node n1452479849, and 9 km of total upstream flows in.
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• 左股沢, which joins it at N 41° 52′ 9″, E 140° 15′ 28″ at OSM node n1452479849, and 7 km of total upstream flows in.
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