Cergy-Pontoise is a new town and an agglomeration community in France, in the Val-d'Oise department, northwest of Paris on the river Oise. It owes its name to two of the communes that it covers, Cergy and Pontoise. Its population is 199,143 , in an area of 84.2 km2. Created in the 1970s, it became an agglomeration community in 2004.
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