The geometry and facies of deposits in lake Afourgagh (Middle-Atlas, Morocco) provide evidence for successive major lake level fluctuations during the last 2,500 years. Sedimentation is mainly biogenic with the laying down of thick charophyte-rich tufas interbedded with silty layers in distal areas and palaeosols in proximal areas. These alternations point to four major deposit sequences with lowstand phases. The first two phases are dated at ca. 2426 and 1869 cal B.P. These events appear to be linked to major arid episodes on a regional scale. However, climatic impact has been modulated by human activities, particularly during recent decades.