The two dominant physical features of South America are the Andean mountain range in the west and the Amazon River basin in the northern and central regions of the continent. The Andes stretch 5,500 miles from north to south and peak at Aconcagua, 22,841 feet above sea level.
The Amazon River basin, with an area of roughly 2.7 million square miles, is the largest watershed in the world. Measurements of the river vary, but the Amazon is typically cited as being 3,903 to 4,195 miles long, making it one of the lengthiest in the world. The Amazon originates in smaller tributaries fed from snow melting in the Andes. It winds directly into the Atlantic, where it delivers a flow of 7,381,000 cubic feet of water to the ocean every second.