第一幹川

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第一幹川 flows into 旧美唄川 , which it joins at N 43° 17′ 38″, E 141° 43′ 59″ at OSM node n1463427635, and there 82 km of total upstream flows in. load it's distributaries

第一幹川 has 2 tributaries.

• 二号川, which joins it at N 43° 17′ 32″, E 141° 46′ 4″ at OSM node n1463427265, and 5 km of total upstream flows in.
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• 川内川, which joins it at N 43° 16′ 0″, E 141° 49′ 10″ at OSM node n6533449054, and 1 km of total upstream flows in.
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