The arrondissement of Pontoise is an arrondissement of France in the Val-d'Oise department in the Île-de-France region. Since the January 2017 reorganization of the arrondissements of Val-d'Oise, it has 105 communes.
Wikipedia https://en.wikipedia.org/wiki/Arrondissement_of_Pontoise
Coordinates 49°3'3.184" N 2°6'2.904" E
