Argentina is a Country in southern South America. Argentina can be divided into four general regions: the North, the Pampas, Patagonia, and the Andes Mountains. The subtropical plains in the northeast are divided by the Paraná River into Mesopotamia to the east and Gran Chaco to the west and north. The Pampas, south and west of the Paraná, is one of the world’s most productive agricultural areas and the country’s most populous region. Patagonia lies south of the Colorado River. The Argentine Andes include the continent’s highest peak, Mount Aconcagua. Argentina’s hydrology is dominated by rivers that include the Paraná, Uruguay, and Pilcomayo, which drain into the Río de la Plata.