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canton, southwestern Switzerland, bordering France and the Jura Mountains to the west and Lake Geneva (Lac Leman) to the south. It has an area of 1,240 sq mi (3,212 sq km). In the west it extends a short way along the shores of Lake Neuchatel, with a long narrow eastern tongue stretching past Payerne. The Avenches region, a few miles beyond, forms an enclave in Fribourg canton, parts of which, in turn, form enclaves in Vaud. The canton's southeastern part, north and east of the Rhone River, is Alpine, containing Les Diablerets (10,531 ft [3,210 m]), its highest summit, and more than 4 sq mi of glaciers. The central area is hilly and morainic with plains along the lakes.