Its name comes from its rugged and verdant relief, apparently resembling the Swiss Alps, with gorges carved by the river Orne and its tributaries, and by erosion in the Armorican Massif between Putanges-Pont-Écrepin and Thury-Harcourt.A State Railways poster, from the 1900s, promotes "travel at reduced prices" and shows, under the title "La Suisse normande", a view of the Orne valley in Clecy.[11][12] After the First World War, the mayor of Clécy wanted to cement the town as a major tourist resort notably by creating safe drinking water and the proper treatment of efluents, a rarity for the time.[13] In 1932, the mayor, then invited the Under-Secretary of State for Tourism, who visited Thury-Harcourt, LaRoche d'Oëtre, Falaise, and solemnly declared Clécy capital of Swiss Normandy.[16][14]4 In 1960 Rabodanges Lake was formed by EDF when they created a hydroelectric dam on the Orne River[17] In 2007 Thury-Harcourt hosted the European Canoe Polo Championship.