Val-d'Oise is a department in the Île-de-France region, Northern France. It was created in 1968 following the split of the Seine-et-Oise department. In 2019, Val-d'Oise had a population of 1,249,674. Wikipedia
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Geography. The région lies in the centre of the Paris Basin and consists of limestone plains with a gently rolling relief. The principal rivers are the Seine ...