Viosne
The Viosne is a Rivière which takes its source between Lavilletertre and Lierville, in the Département of Oise. Long, including 25 in the Val-d'Oise, it 27 km is thrown in the Oise out of Right Bank with Pontoise (Val-d'Oise) after having followed a north-western, south-eastern orientation.
It has multiple arms, often " morts" , (whose with Osny, the Grass snake ) and forms many small ponds. It will be noted that part of its course with Pontoise is carried out in underground.
Sprinkled cities
of upstream downstream:-
Department of Oise
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Department of the Val-d'Oise
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