The major desert located in the southwest region of the United States is the Sonoran Desert. Covering parts of Arizona, California, and Mexico, it is characterized by its unique biodiversity and striking landscapes. The Sonoran Desert experiences extreme temperature variations between day and night, with summer temperatures reaching over 100°F (38°C). Home to iconic flora like the saguaro cactus, it supports a rich array of wildlife adapted to arid conditions. The desert's beauty attracts outdoor enthusiasts and tourists, making it a popular destination for activities such as hiking and photography.