La Grouches

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La Grouches flows into L'Authie , which it joins at N 50° 9′ 16″, E 2° 20′ 7″ at OSM node n1069681309, and there 91 km of total upstream flows in. load it's distributaries

La Grouches has 5 tributaries.

• La Grouche, which joins it at N 50° 13′ 2″, E 2° 28′ 16″ at OSM node n1349096563, and 2 km of total upstream flows in.
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• (unnamed), which joins it at N 50° 11′ 42″, E 2° 24′ 29″ at OSM node n4037067294, and 1 km of total upstream flows in.
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• (unnamed), which joins it at N 50° 11′ 34″, E 2° 23′ 52″ at OSM node n1072785041, and 797 m of total upstream flows in.
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• (unnamed), which joins it at N 50° 11′ 49″, E 2° 25′ 9″ at OSM node n1072750881, and 290 m of total upstream flows in.
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• (unnamed), which joins it at N 50° 11′ 0″, E 2° 23′ 10″ at OSM node n1071038427, and 74 m of total upstream flows in.
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