South America is 12 times larger than Alaska (USA).
Area: 1,477,953 km2 US Census
Population: 735,132 (July 2013) US Census
Alaska is a U.S. state situated in the northwest extremity of the North American continent. Wikipedia
Area: 17,840,000 km2 DESA
Population: 392,555,000 (2012) DESA
South America is a continent located in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. It can also be considered as a subcontinent of the Americas. Wikipedia