関山川

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関山川 flows into 美馬牛川 , which it joins at N 42° 56′ 33″, E 143° 2′ 17″ at OSM node n1462276687, and there 44 km of total upstream flows in. load it's distributaries

関山川 has 2 tributaries.

• 土井川, which joins it at N 42° 57′ 5″, E 143° 2′ 12″ at OSM node n1462279811, and 10 km of total upstream flows in.
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• (unnamed), which joins it at N 43° 1′ 10″, E 142° 59′ 29″ at OSM node n1462319888, and 390 m of total upstream flows in.
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