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The fossiliferous deposits of a large palaeolake were recently observed in southern Jordan, overlapping into Saudi Arabia. Preliminary U/Th analyses of Cerastoderma sp. shells date the lake at 116 +/- 5.3 kyr and 76.8 +/- 8.2 kyr. Archaeological sites with Levalloiso-Mousterian artifacts are superimposed on those deposits, which fit a possible sub-stage 5a date. These new data imply a possible geographical continuity of the Last Pleistocene Interglacial humid phase throughout the Saharo-Arabian arid belt, in the same climatic context, as the palaeolakes in northern Mall and Fezzan. (C) 2000 Academie des sciences / Editions scientifiques et medicales Elsevier SAS.