Agathe
1961 CE.
Shown on the map at 24.057°, 5.052°.
Agate was the codename of the first French nuclear underground test. It was conducted by the Joint Special Weapons Command on 7 November 1961, at the Oasis Military Experiments Centre near In Ekker, French Algeria at the Tan Afella in the Hoggar Mountains, during the Algerian War. It is named after the Agate, a rock formation used in jewelry.
Text from the Wikipedia article Agate (nuclear test), licensed CC BY-SA 4.0.