観音平川

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観音平川 flows into 片貝川 , which it joins at N 36° 11′ 53″, E 138° 28′ 20″ at OSM node n748627471, and there 29 km of total upstream flows in. load it's distributaries

観音平川 has 2 tributaries.

• 大曲川, which joins it at N 36° 10′ 11″, E 138° 25′ 46″ at OSM node n747916732, and 10 km of total upstream flows in.
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• 中沢川, which joins it at N 36° 11′ 42″, E 138° 28′ 28″ at OSM node n748262226, and 6 km of total upstream flows in.
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