西コウエイ川

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西コウエイ川 flows into 歴舟中の川 , which it joins at N 42° 31′ 23″, E 143° 6′ 10″ at OSM node n1453075824, and there 101 km of total upstream flows in. load it's distributaries

西コウエイ川 has 2 tributaries.

• 中コウエイ川, which joins it at N 42° 31′ 14″, E 143° 5′ 39″ at OSM node n1453075182, and 6 km of total upstream flows in.
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• ポン一の沢川, which joins it at N 42° 31′ 19″, E 143° 5′ 39″ at OSM node n1453075480, and 3 km of total upstream flows in.
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