大石沢

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大石沢 flows into 小本川 , which it joins at N 39° 53′ 29″, E 141° 37′ 28″ at OSM node n754402013, and there 62 km of total upstream flows in. load it's distributaries

大石沢 has 1 tributaries.

• 浅不動沢, which joins it at N 39° 53′ 52″, E 141° 37′ 31″ at OSM node n753585807, and 6 km of total upstream flows in.
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