The amaing 18m diameter stone circle was found in the Tenere Desert in Niger, just in front of the mountain Adrar Madet (11 ° 18'39 "N, 10 ° 27'E ) . We find four identical formations around 1700m distance in the direction of the 4 cardinal points. in 1997 , when George Steinmetz NGS took this photograph , he did not know their origin, purpose and age. According to  informations , it would be one of many topographical benchmarks used by the French army, but more recent study mau lead to UFO landing site to be confirmed . it should be noted that at 800 km to the north, the plateau of Adrar Madet contains two unconfirmed impact craters .