外芳名沢

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外芳名沢 flows into 長川 , which it joins at N 39° 57′ 59″, E 141° 2′ 43″ at OSM node n754100253, and there 27 km of total upstream flows in. load it's distributaries

外芳名沢 has 2 tributaries.

• 内芳名沢, which joins it at N 39° 59′ 6″, E 141° 2′ 26″ at OSM node n754195783, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 39° 58′ 9″, E 141° 2′ 47″ at OSM node n754159547, and 1 km of total upstream flows in.
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