The western United States contain all of the deserts of the United States with the exception of the Desert of Main .
It is also the most geographically diverse , incorporating geographic regions such as the temperate rainforests of the Northwest , the highest mountain ranges ( including the Rocky Mountains , and the Sierra Nevada ) , the western portions of the Great Plains , and with the exception of the Desert of Maine The west has all of the desert areas located in the United States ( the Mojave , Sonoran , Great Basin , and Chihuahuan deserts ) .
Western United States