The Verdon Gorge (in French: Gorges du Verdon or Grand canyon du Verdon), in south-eastern France (Alpes-de-Haute-Provence), is a river canyon that is often considered to be one of Europe's most beautiful. It is about 25 kilometres long and up to 700 metres deep. It was formed by the Verdon River, which is named for its startling turquoise-green colour, one of the location's distinguishing characteristics. The most impressive part lies between the towns of Castellane and Moustiers-Sainte-Marie, where the river has cut a ravine to a depth of 700 metres through the limestone mass. At the end of the canyon, the Verdon River flows into the artificial lake of Sainte-Croix-du-Verdon (in French: Lac de Sainte-Croix).
Because of its proximity to the French Riviera, the gorge is very popular with tourists, who can drive around its rim, rent kayaks to travel on the river, or hike. The limestone walls, which are several hundreds of metres high, attract many rock climbers. It is considered an outstanding destination for multi-pitch climbing. The variety of 1,500 routes encompass cracks, pillars and seemingly endless walls, and range in distance from 20m to over 400m. The climbing is generally of a technical nature.
Wikipedia : http://en.wikipedia.org/wiki/Gorges_du_Verdon