At the center of the Yosemite National Park, 1,200 square miles of wilderness set aside in 1890 for the preservation of the Sierra Navada, is the Yosemite Valley. This half mile deep depression was formed by glaciers during the last ice age. Now abundant with lakes, meadows, granite summits, 3,000 feet domes and three of the world's highest waterfalls. A valley of magnificence and built with the power of nature.
http://www.nationalparkreservations.com/info/yosemite/index.php [accessed 8 June 2010]