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The spring site of Hummal is located in Central Syria, near the village of El Kowm between the Euphrates basin and the desert steppe stretching from Palmyra to Deir-ez-Zor. In 1966 the well was noted in a survey as Bir Onusi and a short preliminary study was carried out at the beginning of the 1980s. Since 1997, the Institute for Prehistory and Archaeological Science of the University of Basel has undertaken a complete interdisciplinary research program of this major site under the direction of J.M Le Tensorer, supported by the Swiss National Science Foundation and associated with the Directorate General of Antiquities and Museums of Syria under the direction of S. Muhesen. The site of Hummal is a prominent mound at an artesian spring built out of the sediments, which piled up during the whole Quaternary. Tectonic faults in the bed rock enabled the underlying water in a karstic system to flow out into a dolina, which trapped lacustrine, limnic and aeolian sediments since the Oldest Pleistocene. The impressive stratigraphy - 20 m high - comprises 23 geological units preserving a great number of archaeological levels. It covers an extremely long period of time ranging from the Oldest Palaeolithic (Oldowan) to Upper Palaeolithic (Aurignacian) over more than a million years. This impressive Old and Middle Palaeolithic sequence comprises several layers of Oldowan-like assemblage (23-16), an Acheuleo-Tayacian complex (14-13), five layers of Yabrudian (12-8) at least four levels of Hummalian (7, 6c, 6b, 6a) and a thick sediment complex with 8 Mousterian layers, each of them liable to be subdivided into several sublayers. The lithic industry in the lowest levels of the Hummal sequence, associated with abundant remains of large mammals, can be characterized by non-modified, quite fresh flakes, with, once in a while, traces of use but never bearing intentional retouches. Theses flakes are found with pebble-tools: choppers, chopping-tools, polyhedrons, bolas and core-like artifacts. This assemblage is typical in a broad sense of archaic Palaeolithic whose debitage corresponds to mode I. From a techno-typological point of view, this industry tallies quite well with the so-called Oldowan stage. It shows remarkable similarities with the oldest assemblages at Ubeidiya but, so far, with no occurrence of bifacial knapping. If the layers 17 and 18 of Hummal relate to this period dating back to 1.6 to 1.2 million years, these levels would be the oldest ones ever found in central Syria. However, as we have no absolute dating at our disposal so far, we will remain careful in assigning a chronological time span for these layers. For this area, from a stratigraphic point of view, the Oldowan levels of Hummal occur before the Acheulean and certainly before the Acheulean sequence of El Meirah (region of El Kowm) which is itself related to the period before Matuyama-Brunhes paleomagnetic reverse. Dating of the lowest sequence of Hummal is underway. If we take into account stratigraphic and techno-typological observations, we assume that the Oldowan-like levels of the site should be older than one million years at least. The sequence of Hummal is one of the largest in the Near-East. Therefore, it can be regarded as a key-site for world prehistory. (C) 2011 Elsevier Masson SAS. All rights reserved.