The western geography of the Americas is dominated by the American cordillera, with the Andes running along the west coast of South America and the Rocky Mountains and other Pacific Coast Ranges running the western side of North America. The 2300 km long Appalachian Mountains run along the east coast of North America from Alabama to Newfoundland. North of the Appalachians, the Arctic Cordillera runs along the eastern coast of Canada.
Between its coastal mountain ranges, North America has vast flat areas. The Interior Plains spread over much of the continent with low relief. The Canadian Shield covers almost 5 million km² of North America and is generally quite flat. Similarly, the north-east of South America is covered by the flat Amazon Basin. The Brazilian Highlands on the east coast are fairly smooth but show some variations in landform, while further south the Gran Chaco and Pampas are broad lowlands.