Southwest Extreme Triangle

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The Southwest Extreme Triangle is a group of counties in the Southwest United States. The points of the triangle, which are roughly equidistant to one another, cover the metro areas of San Diego, Las Vegas, and Phoenix. They are linked by an extremely hot climate and an abundance of tourism. Once isolated areas containing little more than farms and sparsely inhabited desert, they are now among the fastest-growing counties in the US.

The counties in the Southwest Triangle include the following:

In Arizona

Sub-Regions and geographical features include: