長谷沢

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長谷沢 flows into 十川 , which it joins at N 40° 39′ 56″, E 140° 37′ 54″ at OSM node n753138163, and there 9 km of total upstream flows in. load it's distributaries

長谷沢 has 2 tributaries.

• (unnamed), which joins it at N 40° 39′ 0″, E 140° 39′ 18″ at OSM node n753225795, and 940 m of total upstream flows in.
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• (unnamed), which joins it at N 40° 39′ 8″, E 140° 39′ 0″ at OSM node n753831627, and 695 m of total upstream flows in.
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