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The American Cordillera is a chain of mountain ranges (cordillera) that consists of an almost continuous sequence of mountain ranges that form the western "backbone" of North America, Central America, South America and Antarctica. It is also the backbone of the volcanic arc that forms the eastern half of the Pacific Ring of Fire.

From north to south, this sequence of overlapping and parallel ranges begins with the Alaska Range and the Brooks Range in Alaska and runs through the Yukon into British Columbia. The main belt of the Rocky Mountains along with the parallel Coast Ranges of mountains and islands continue through British Columbia and Vancouver Island. In the United States, the Cordillera branches to include the Rocky Mountains, the Sierra Nevada, and the Cascades and Coast ranges of Washington, Oregon, and California. In Mexico, the Cordillera continues through the Sierra Madre Occidental and Sierra Madre Oriental, as well as the backbone mountains of the Baja California peninsula.

The ranges of the Cordillera from Mexico northwards are collectively called the North American Cordillera or Western Cordillera in the United States and Canada, and also named as the Canadian Cordillera or Pacific Cordillera in Canada.

The Cordillera continues on through the mountain ranges of Central America in Guatemala, Honduras, Nicaragua, Costa Rica, and Panama, and becomes the Andes Mountains of South America. The Andes with their parallel chains and the island chains off the coast of Chile continue through Colombia, Venezuela, Ecuador, Peru, Bolivia, Argentina, and Chile to the very tip of South America at Tierra del Fuego. In addition, the range can possibly be followed through the arcuate South Georgia Ridge across the Southern Ocean to the mountains of Graham Land on the Antarctic Peninsula.

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