Wadi As-Sirhan Basin, Saudi Arabia
Center pivot irrigation is used throughout the Wadi As-Sirhan Basin of Saudi Arabia. Water is mined from depths as great as one kilometer (~3,000 ft), pumped to the surface, and evenly distributed by sprinklers that rotate 360 degrees. Spurred by a government effort to strengthen its agriculture sector, cultivated land in the country grew from 400,000 acres in 1976 to more than 8 million acres by 1993. The diameter of the fields you see here are approximately three kilometers (1.9 miles) across.