Le Semnon

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Le Semnon flows into La Vilaine , which it joins at N 47° 53′ 57″, W 1° 45′ 26″ at OSM node n369722667, and there 2,522 km of total upstream flows in. load it's distributaries

Le Semnon has 23 tributaries.

• Ruisseau de la Couyère, which joins it at N 47° 50′ 24″, W 1° 30′ 25″ at OSM node n410374401, and 148 km of total upstream flows in.
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• La Brutz, which joins it at N 47° 49′ 52″, W 1° 28′ 59″ at OSM node n373938131, and 71 km of total upstream flows in.
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• Ruisseau de Maigé, which joins it at N 47° 52′ 22″, W 1° 38′ 59″ at OSM node n6203262660, and 28 km of total upstream flows in.
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• Ruisseau des Bruères, which joins it at N 47° 51′ 30″, W 1° 37′ 15″ at OSM node n775981454, and 25 km of total upstream flows in.
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• Le Matz, which joins it at N 47° 49′ 40″, W 1° 23′ 18″ at OSM node n373914608, and 18 km of total upstream flows in.
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• Ruisseau des Roches, which joins it at N 47° 49′ 15″, W 1° 15′ 18″ at OSM node n1298472977, and 14 km of total upstream flows in.
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• La Masse, which joins it at N 47° 49′ 40″, W 1° 16′ 49″ at OSM node n7002852508, and 12 km of total upstream flows in.
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• Le Toulon, which joins it at N 47° 50′ 11″, W 1° 18′ 51″ at OSM node n1298472824, and 11 km of total upstream flows in.
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• Les Caves, which joins it at N 47° 48′ 59″, W 1° 14′ 59″ at OSM node n1298472658, and 10 km of total upstream flows in.
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• Le Choisel, which joins it at N 47° 53′ 32″, W 1° 42′ 53″ at OSM node n4200561214, and 3 km of total upstream flows in.
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• (unnamed), which joins it at N 47° 50′ 31″, W 1° 32′ 50″ at OSM node n746173872, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 47° 52′ 18″, W 1° 39′ 31″ at OSM node n403069559, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 47° 50′ 12″, W 1° 32′ 32″ at OSM node n393984369, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 47° 49′ 51″, W 1° 26′ 18″ at OSM node n1345501487, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 47° 50′ 39″, W 1° 33′ 35″ at OSM node n7603259589, and 944 m of total upstream flows in.
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• (unnamed), which joins it at N 47° 50′ 40″, W 1° 33′ 38″ at OSM node n7533292156, and 825 m of total upstream flows in.
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• (unnamed), which joins it at N 47° 48′ 28″, W 1° 14′ 33″ at OSM node n1726476344, and 783 m of total upstream flows in.
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• (unnamed), which joins it at N 47° 49′ 57″, W 1° 27′ 3″ at OSM node n7602915293, and 628 m of total upstream flows in.
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• (unnamed), which joins it at N 47° 50′ 1″, W 1° 19′ 33″ at OSM node n2505830610, and 525 m of total upstream flows in.
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• (unnamed), which joins it at N 47° 50′ 28″, W 1° 34′ 4″ at OSM node n896760035, and 495 m of total upstream flows in.
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• Ruisseau de la Farouillais, which joins it at N 47° 54′ 11″, W 1° 43′ 41″ at OSM node n2303090557, and 446 m of total upstream flows in.
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• (unnamed), which joins it at N 47° 48′ 24″, W 1° 13′ 44″ at OSM node n1726481826, and 380 m of total upstream flows in.
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• (unnamed), which joins it at N 47° 49′ 44″, W 1° 25′ 10″ at OSM node n373937233, and 266 m of total upstream flows in.
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