Mont Ventoux, although geologically part of the Alps, is often considered to be separate from them, due to the lack of mountains of a similar height nearby. It stands alone to the north of the Luberon range, separated by the Monts de Vaucluse, and just to the east of the Dentelles de Montmirail, its foothills. The top of the mountain is bare limestone without vegetation or trees, which makes the mountain's barren peak appear from a distance to be snow-capped all year round (its snow cover actually only lasts from December to April). Its isolated position overlooking the valley of the Rhône ensures that it dominates the entire region and can be seen from many miles away on a clear day.