Many lakes extend in the Puy-de-Dôme department. The most renowned are located in the Sancy area and the Auvergne Volcanoes Regional Nature Park, like Lake Servières. A multitude of water bodies also sprinkle the Pays des Combrailles, the Livradois-Forez, and Pays d'Issoire-Val-d'Allier. In some lakes, the quality of water is certified, and swimming is authorized and supervised. In others, it is allowed without supervision, although it is rarely the purpose of mountain lakes.