Lake Annecy (French: Lac d'Annecy, French: [lak dansi]) is a perialpine lake in Haute-Savoie in France. It is named after the city of Annecy, which marks the start of the Thiou, Lake Annecy's outflow river. It is the third-largest lake in France, after the Lac du Bourget and Lac de Grand-Lieu, if the French part of Lake Geneva, which is shared between Switzerland and France, is excluded. It is known as "Europe's cleanest lake" because of strict environmental regulations introduced in the 1960s. …