Haruj Volcanic Field and Desert Agriculture in Libya – February 3rd, 201227.4N 20.0E
The large, dark brown area in the Libyan Desert on the left side of the main image is the Haruj, a large volcanic field. It spreads across 45,000 km2 (17,000 sq mi) in central Libya, and contains about 150 volcanoes, including numerous basaltic scoria cones and about 30 small shield volcanoes, along with craters and lava flows.
Near the right edge of the main image, and visible at a greater magnification in the close-up, is desert agriculture. These fields appear circular due to center-pivot irrigation (sometimes called central pivot irrigation or circle irrigation), a method of crop irrigation in which equipment rotates around a pivot, creating a circular pattern in crops when viewed from above.