Le By

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Le By flows into (unnamed) , which it joins at N 50° 23′ 14″, E 3° 56′ 33″ at OSM node n2299213180, and there 25 km of total upstream flows in. load it's distributaries

Le By has 2 tributaries.

• Ruisseau de Louvroit, which joins it at N 50° 22′ 42″, E 3° 55′ 59″ at OSM node n7994547774, and 14 km of total upstream flows in.
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• (unnamed), which joins it at N 50° 22′ 19″, E 3° 55′ 15″ at OSM node n6993461006, and 8 km of total upstream flows in.
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