Related Clues:

• Much of Mauritania
• Place for mirages
• Arizona, mostly
• "The English Patient" setting
• Joshua tree habitat
• Shirk one's duty, in a big way
• Tucson's environs
• Leave without leave
• Most of 49-Down
• Common chuckwalla habitat
• The Kalahari, for one
• Low-rain region
• Rainless expanse
• Prickly pear's place
• Arid area