Boy! That was an easy one! Did you find both of the rings? This is the Aorounga crater in northern Chad. Aorounga's age is not well known, but it is several hundred million years old. The dotted circle at upper right may be another crater, so Aorounga may be part of a crater chain formed long ago. Aorounga, like most of the craters on Earth, was buried under rocks and sand for a long time, and has been uncovered again by recent erosion.