Lake Tahoe (/ˈtɑːhoʊ/; Washo: dáʔaw) is a large freshwater lake in the Sierra Nevada of the United States. At a surface elevation of 6,225 ft (1,897 m), it is located along the border between California and Nevada, west of Carson City. Lake Tahoe is the largest alpine lake in North America. Its depth is 1,645 ft (501 m), making it the deepest in the United States after Crater Lake (1,945 ft (593 m). Additionally, Lake Tahoe is the largest lake by volume in the United States behind the five Great Lakes at 122,160,280 acre·ft (150,682,490 dam3). The lake was formed about 2 million years ago and is a part of the Lake Tahoe Basin with the modern lake being shaped during the ice ages. It is known for the clarity of its water and the panorama of surrounding mountains on all sides.