横山堰

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横山堰 flows into 立花川 , which it joins at N 33° 55′ 29″, E 135° 28′ 30″ at OSM node n974828171, and there 9 km of total upstream flows in. load it's distributaries

横山堰 has 2 tributaries.

• (unnamed), which joins it at N 33° 55′ 58″, E 135° 28′ 56″ at OSM node n974807904, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 33° 55′ 53″, E 135° 28′ 38″ at OSM node n974516180, and 364 m of total upstream flows in.
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