永井川

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永井川 flows into 利根川 , which it joins at N 36° 35′ 11″, E 139° 3′ 28″ at OSM node n760072559, and there 1,590 km of total upstream flows in. load it's distributaries

永井川 has 2 tributaries.

• (unnamed), which joins it at N 36° 35′ 13″, E 139° 4′ 30″ at OSM node n759326874, and 720 m of total upstream flows in.
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• 赤久保沢, which joins it at N 36° 35′ 18″, E 139° 4′ 5″ at OSM node n760066530, and 272 m of total upstream flows in.
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