後閑川

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後閑川 flows into 九十九川 , which it joins at N 36° 19′ 26″, E 138° 50′ 37″ at OSM node n760126024, and there 69 km of total upstream flows in. load it's distributaries

後閑川 has 3 tributaries.

• 長足川, which joins it at N 36° 19′ 48″, E 138° 50′ 7″ at OSM node n760041798, and 4 km of total upstream flows in.
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• 長源寺川, which joins it at N 36° 21′ 31″, E 138° 48′ 2″ at OSM node n759341707, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 36° 21′ 13″, E 138° 48′ 41″ at OSM node n759274094, and 687 m of total upstream flows in.
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