山口川

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山口川 flows into 閉伊川 , which it joins at N 39° 38′ 12″, E 141° 56′ 34″ at OSM node n754329005, and there 336 km of total upstream flows in. load it's distributaries

山口川 has 2 tributaries.

• (unnamed), which joins it at N 39° 38′ 55″, E 141° 56′ 10″ at OSM node n753468461, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 39° 39′ 11″, E 141° 55′ 10″ at OSM node n753780282, and 2 km of total upstream flows in.
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