The Rouillon is a small river in southern Île-de-France (France), left tributary of the Yvette, which is a tributary of the Orge. Its source is in Villejust, north of Longjumeau, in the Essonne department. It is 9.5 km (5.9 mi) long.[1]
The Rouillon crosses the following départements and towns:
A bridge, call le pont des Templiers (templars bridge), considering as the older bridge in Essonne department, is nearby Balizy, an area of Longjumeau. It was built in the 13th century.
