Raetia Regio (Lutetia)

Province of the Roman Empire at the time of Lutetia, its location corresponds to present-day eastern Switzerland and parts of the adjacent countries.

A regio is a large area marked by reflectivity or color distinctions from adjacent areas, or a broad geographic region. On Lutetia they are named after discoverer of Lutetia, and provinces of the Roman Empire at the time of Lutetia.