Your answer was irrigation fields. people have made the same choice. Congratulations! This was a tough one.
This picture is from Al Kufrah oasis in southern Libya. Libya is a country located in northern Africa. In this desert area, the only constant suppy of water comes from underground.
To make it possible to grow certain types of plants, the people who live here must irrigate the desert. They use a very long pipe with holes in it which turns around from the center of each field like the big hand of a clock. The water sprays out of the holes and brings life to desert land. Each round field in this image has a diameter of one-half mile and the entire area is about 20 miles across!