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.

[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.

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