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Madna or Talemzane (Arabic: مادنة / تالمزان) is an impact crater in Algeria, 40 km south-east of Hassi Delaa (a small city).
Map of Talemzane crater, Algeria
Explored for the first time in 1928, studied in 1950 and 1988 by reshars from university of Oran (Algeria) and Nice (France). It is 1.75 km in diameter and the age is estimated to be less than three million years and is probably Pliocene.
References
Talemzane crater Wikipedia(Text) CC BY-SA