After three decades of intense archaeological prospection in Sandy Flanders, detailed archaeological distribution maps have been produced, showing a distinct pattern regarding the temporal and spatial distribution of the archaeological sites. In order to explain the observed changes in site location an inter-disciplinary project 'Prehistoric settlement and land-use systems in Sandy Flanders (NW Belgium): a diachronic and geoarchaeological approach' has been undertaken. The starting point is that, besides human factors, environmental conditions may have influenced settlement conditions through time, and our research aims thus at analyzing the occupational history of the area in terms of environmental potentials. Indeed, since the Late Pleniglacial the landscape in this area was subjected to major changes due to abrupt climatic fluctuations, and numerous, generally small but elongated sand dunes and shallow lakes were formed, which may have played a role in the settlement dynamics. Palaeoecological (pollen and NPPs, plant macroremains, charcoal, diatoms, ostracods, molluscs, beetles, chironomids) and sedimentological (water content, LOI, magnetic susceptibility, gamma-density, granulometry) analyses are ongoing to reconstruct local and regional past environments and climate change at high resolution during the Late Glacial and Early Holocene. This contribution presents the first palaeoenvironmental results obtained for three sedimentary sequences collected in the Moervaart area, first densely inhabited and then deserted, where a trench and 15 mechanical corings have been made at five different locations along a N-S transect: from a deksandridge to a palaeochannel crossing a shallow but large palaeolake, through the deepest part of the depression. They provide new insights in the palaeolandscape evolution of this area, and may allow us to evaluate in detail how and to which degree this evolution determined the prehistoric occupation and exploitation within Sandy Flanders.

Abstract of an Oral Presentation or a Poster