北海上川

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北海上川 flows into 矢田川 , which it joins at N 35° 11′ 57″, E 137° 6′ 46″ at OSM node n727086103, and there 39 km of total upstream flows in. load it's distributaries

北海上川 has 2 tributaries.

• 海上川, which joins it at N 35° 11′ 48″, E 137° 7′ 3″ at OSM node n727189589, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 35° 11′ 47″, E 137° 7′ 25″ at OSM node n727225111, and 838 m of total upstream flows in.
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