While most fairy circles appear in the Namib Desert, they occupy a 1,800-kilometer-long (1,100 mi) stretch that reaches Cape Province in South Africa. The purpose of these wells is to extract natural gas, which is mostly methane, from the local coal-rich environment. According to NASA, the possibility that the six-year methane event was a natural gas leak cannot be discounted. 6 The Unknown SpeciesThe oldest handmade stone tools ever discovered were unearthed in Kenya’s desert badlands. Curious for answers, scientists discovered an area in the Sahara Desert where mysterious blocks of glass litter the sand.