秋山川

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秋山川 flows into 坪川 , which it joins at N 35° 34′ 44″, E 138° 27′ 59″ at OSM node n758906805, and there 42 km of total upstream flows in. load it's distributaries

秋山川 has 3 tributaries.

• 塩沢川, which joins it at N 35° 34′ 52″, E 138° 27′ 19″ at OSM node n758761874, and 2 km of total upstream flows in.
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• 大石沢川, which joins it at N 35° 35′ 22″, E 138° 26′ 30″ at OSM node n759076618, and 2 km of total upstream flows in.
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• 北沢, which joins it at N 35° 35′ 13″, E 138° 26′ 30″ at OSM node n758677462, and 1 km of total upstream flows in.
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