Region in the extreme south of South America, shared by Argentina and Chile. The region comprises the southern section of the Andes Mountains, lakes, fjords, and glaciers in the west, as well as deserts, plateaus, and steppes in the east. Patagonia is limited by the Pacific Ocean to the west, the Atlantic Ocean to the east and many arms of water that connect them to the Strait of Magellan, the Beagle Channel and the Drake Passage to the south.