大海川

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大海川 flows into 中谷川 , which it joins at N 36° 52′ 11″, E 137° 59′ 10″ at OSM node n748652853, and there 19 km of total upstream flows in. load it's distributaries

大海川 has 5 tributaries.

• 大倉沢, which joins it at N 36° 53′ 57″, E 137° 58′ 50″ at OSM node n748083040, and 3 km of total upstream flows in.
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• 中海川, which joins it at N 36° 52′ 19″, E 137° 59′ 2″ at OSM node n748622308, and 2 km of total upstream flows in.
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• 黒沢, which joins it at N 36° 53′ 57″, E 137° 58′ 50″ at OSM node n748083040, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 36° 53′ 1″, E 137° 58′ 30″ at OSM node n748228071, and 511 m of total upstream flows in.
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• (unnamed), which joins it at N 36° 53′ 16″, E 137° 58′ 34″ at OSM node n748603680, and 464 m of total upstream flows in.
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