The 114 sq km (44 sq mi) lake has been called the heart of Switzerland and it is surrounded by four cantons: Lucerne, Uri, Schwyz and Unterwalden.Water sports are popular and many explore the lake''s wonders by paddle steamer. A glance or two at a shimmering expanse of water with majestic steep peaks of limestone hunched over the coastline, forests coming down to the shore filled with deer, chamois, foxes, and Alpine-native marmots; and fertile hillsides, meadows and valleys would not dissapoint you.