西一号川

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西一号川 flows into 声問川 , which it joins at N 45° 23′ 47″, E 141° 46′ 30″ at OSM node n1465847160, and there 362 km of total upstream flows in. load it's distributaries

西一号川 has 4 tributaries.

• サラキトマナイ川, which joins it at N 45° 22′ 38″, E 141° 45′ 23″ at OSM node n1465840725, and 34 km of total upstream flows in.
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• ウツナイ川, which joins it at N 45° 23′ 7″, E 141° 45′ 52″ at OSM node n1465843597, and 11 km of total upstream flows in.
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• 沼の沢川, which joins it at N 45° 22′ 2″, E 141° 44′ 51″ at OSM node n1465833743, and 4 km of total upstream flows in.
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• (unnamed), which joins it at N 45° 23′ 7″, E 141° 45′ 52″ at OSM node n1465843597, and 3 km of total upstream flows in.
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