Pontoise

Pontoise is a commune in the northwestern suburbs of Paris, France. It is located 28.4 km (17.6 mi) from the centre of Paris, in the "new town" of Cergy-Pontoise.Pontoise is the official préfecture (capital) of the Val-d'Oise département, although in reality the préfecture building and administration, as well as the department council, are located inside the neighboring commune of Cergy, which is regarded as the de facto capital of Val-d'Oise.Pontoise is the historical capital of the Vexin français. Its foundation dates from the Roman times (Pontisara).