Mérantaise
The Mérantaise is a small river in southern Île-de-France, left tributary of the Yvette, which is a tributary of the Orge. It is long. Its source is in Voisins-le-Bretonneux, near Versailles, in the Yvelines department.
Geography
The Yvette crosses the following départements and towns:- Yvelines department : Voisins-le-Bretonneux, Magny-les-Hameaux,
- Essonne department : Saint-Aubin, Villiers-le-Bâcle, Gif-sur-Yvette