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美国幅员广阔,地处两洋之间,气候复杂。山脉多南北走向,东部有阿巴拉契亚山脉构成的古老山系,中部偏西为包括东侧的落矶山脉和西侧的内华达山脉以及沿海山脉的科迪勒拉山系。两大山系间属北美大平原所在的山间地区。
The United States is vast in size and is located between the two seas and has a complicated climate. The mountains are mostly north-south, with the ancient mountain systems of the Appalachian Mountains in the east and the Rocky Mountains in the east and the Sierra Nevada in the west, and the Cordillera Mountains in the coastal ranges. Between the two mountains belong to the North American plains where the mountain area.