Patagonia is a geographic region containing the southernmost portion of South America. Mostly locate in Argentina and partly in Chile, it comprises the Andes mountains to the west and south, and plateau and low plains to the east. The name Patagonia comes from the word patagon used by Magellan to describe the native people who his expedition thought to be giants. It is now believed the Patagons were actually Tehuelches and Aonikenk with an average height of 1.80 m (~5'11") compared to the 1.55 m (~5'1") average for Spaniards of the time.