保城川

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保城川 flows into 舘岩川 , which it joins at N 37° 5′ 51″, E 139° 35′ 0″ at OSM node n756326662, and there 62 km of total upstream flows in. load it's distributaries

保城川 has 4 tributaries.

• 八木ノ岐川, which joins it at N 37° 6′ 31″, E 139° 35′ 13″ at OSM node n756967340, and 7 km of total upstream flows in.
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• (unnamed), which joins it at N 37° 6′ 49″, E 139° 35′ 27″ at OSM node n757211161, and 4 km of total upstream flows in.
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• 滝ノ岐川, which joins it at N 37° 6′ 56″, E 139° 35′ 24″ at OSM node n756572737, and 3 km of total upstream flows in.
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• 大内沢, which joins it at N 37° 6′ 36″, E 139° 35′ 14″ at OSM node n756629445, and 3 km of total upstream flows in.
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