Location
Les Ulis is a new town located in the Île-de-France, in the south-west of the Parisian agglomeration and in the north-west of the Essonne department. It sits on the Cortabœuf plateau which dominates the Yvette valley, also known as the Chevreuse valley. It is 23km to the south-west of central Paris, 20km north-west of Évry and 14km to the south-east of Versailles.
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