Coordinates: 49°04′56″N 1°37′49″E / 49.0822°N 1.6303°E / 49.0822; 1.6303
La Roche-Guyon is a commune in the Val-d'Oise department in Île-de-France in northern France.
The commune grew around the Château de La Roche-Guyon, upon which historically it depended for its existence. The commune's population in 1999 was 550.
Read more about La Roche-Guyon: Château De La Roche-Guyon, Points of Interest