The Verdon Gorge in Alpes-de-Haute-Provence, is a river canyon that is considered by many to be Europe's most beautiful. It is about 25 kilometers long and up to 700 meters deep. It was formed by the Verdon River, which is named after its startling turquoise-green colour, one of the canyon's most distinguishing characteristics. The most impressive part lies between the towns of Castellane and Moustiers-Sainte-Marie, where the river has cut a ravine up to 700 metres down 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).