黒川

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黒川 flows into 遠賀川 (Onga River) , which it joins at N 33° 48′ 56″, E 130° 42′ 23″ at OSM node n745402769, and there 804 km of total upstream flows in. load it's distributaries

黒川 has 3 tributaries.

• 笹尾川, which joins it at N 33° 48′ 52″, E 130° 42′ 26″ at OSM node n5305696302, and 18 km of total upstream flows in.
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• 新延川, which joins it at N 33° 48′ 6″, E 130° 43′ 10″ at OSM node n745542554, and 3 km of total upstream flows in.
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• 新堀川, which joins it at N 33° 48′ 46″, E 130° 42′ 29″ at OSM node n5305696303, and 295 m of total upstream flows in.
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