Part of the Sahara A to Z series Out in Niger’s Tenere desert, east of the Aïr mountains lies the isolated massif of Adrar Madet (see map below).About 2.5 kilometres directly west of the 20-km long massif’s northern tip, a perfect stone circle lies in the sand.The circle is about 20m in diametre and some … Continue reading ‘M’ is for Mysterious Circles: Adrar Madet, Timetrine