外洞川

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外洞川 flows into 木曽川 , which it joins at N 35° 32′ 33″, E 137° 32′ 8″ at OSM node n726141169, and there 541 km of total upstream flows in. load it's distributaries

外洞川 has 6 tributaries.

• (unnamed), which joins it at N 35° 33′ 31″, E 137° 31′ 22″ at OSM node n725934296, and 3 km of total upstream flows in.
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• 田尻谷, which joins it at N 35° 34′ 19″, E 137° 30′ 12″ at OSM node n725942300, and 2 km of total upstream flows in.
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• 洞建谷, which joins it at N 35° 33′ 24″, E 137° 31′ 29″ at OSM node n726298428, and 2 km of total upstream flows in.
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• 上明ヶ沢, which joins it at N 35° 33′ 41″, E 137° 31′ 16″ at OSM node n726114963, and 942 m of total upstream flows in.
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• 大洞谷, which joins it at N 35° 34′ 1″, E 137° 31′ 2″ at OSM node n726406493, and 928 m of total upstream flows in.
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• 馬滝谷, which joins it at N 35° 33′ 7″, E 137° 31′ 56″ at OSM node n726239077, and 874 m of total upstream flows in.
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