Haute-Savoie is a rugged, contoured region : The Mont Blanc Massif : a crystalline massif, the summit of which is at 4,807m (the highest peak in Europe) The limestone Pre-Alps Valleys hemmed in by steep hills Some facts & figures Average altitude : 1'160 m Highest point : Mont-Blanc 4'807 m Lowest point : Town of Seyssel 252 m Lakes : Lake Léman (52'200 ha, including 21'400 ha in Haute-Savoie), Annecy (2'700 ha) Rivers : 3'500 km Forests : 170'000 ha Nature reserves The Haute-Savoie region has more than 20,000 ha of nature reserves (more than any other French department) : Aiguilles Rouges Nature Reserve in Chamonix (3,300 ha) Les Contamines Nature Reserve at Les Contamines Montjoie (5,500 ha) Bout du Lac Nature Reserve in Doussard (84 ha) Carlaveyron Nature Reserve in Les Houches (598 ha) Passy Nature Reserve (1,717 ha) Delta de la Dranse Nature Reserve in Publier-Amphion (45 ha) Sixt Nature Reserve (9,200 ha) Roc de Chère Nature Reserve in Talloires (68 ha) Bérard Vale Nature Reserve Natural sites Numerous developed or undeveloped natural sites are scattered throughout the region. Among them : The lakes of Annecy, Léman (Geneva) and Montriond, The waterfalls of Seythenex, Ardent and Rouget, The Gruvaz, Fier, Diosaz and Devil's Bridge gorges, The Aiguille du Midi, the Brévent summit, Montenvers and the Sea of Ice, the Bosson glacier, glacier des Bossons, the Fer à Cheval (horseshoe pass) cirque and Semnoz. Etc.