大洞沢

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大洞沢 flows into 道志川 , which it joins at N 35° 33′ 2″, E 139° 8′ 34″ at OSM node n1047474336, and there 138 km of total upstream flows in. load it's distributaries

大洞沢 has 2 tributaries.

• 長又沢, which joins it at N 35° 33′ 17″, E 139° 8′ 20″ at OSM node n1047476230, and 363 m of total upstream flows in.
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• (unnamed), which joins it at N 35° 33′ 25″, E 139° 8′ 24″ at OSM node n1047685731, and 87 m of total upstream flows in.
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