This article reviews key data and debates focused on relative sea-level changes since the Last Interglacial\ud (approximately the last 132,000 years) in the Mediterranean Basin, and their implications for past human\ud populations. Geological and geomorphological landscape studies are critical to archaeology. Coastal regions\ud provide a wide range of resources to the populations that inhabit them. Coastal landscapes are\ud increasingly the focus of scholarly discussions from the earliest exploitation of littoral resources and early\ud hominin cognition, to the inundation of the earliest permanently settled fishing villages and eventually,\ud formative centres of urbanisation. In the Mediterranean, these would become hubs of maritime transportation\ud that gave rise to the roots of modern seaborne trade. As such, this article represents an original\ud review of both the geo-scientific and archaeological data that specifically relate to sea-level changes and\ud resulting impacts on both physical and cultural landscapes from the Palaeolithic until the emergence of\ud the Classical periods. Our review highlights that the interdisciplinary links between coastal archaeology,\ud geomorphology and sea-level changes are important to explain environmental impacts on coastal human\ud societies and human migration. We review geological indicators of sea level and outline how archaeological\ud features are commonly used as proxies for measuring past sea levels, both gradual changes and\ud catastrophic events. We argue that coastal archaeologists should, as a part of their analyses, incorporate\ud important sea-level concepts, such as indicative meaning. The interpretation of the indicative meaning of\ud Roman fishtanks, for example, plays a critical role in reconstructions of late Holocene Mediterranean sea\ud levels. We identify avenues for future work, which include the consideration of glacial isostatic adjustment\ud (GIA) in addition to coastal tectonics to explain vertical movements of coastlines, more research on\ud Palaeolithic island colonisation, broadening of Palaeolithic studies to include materials from the entire\ud coastal landscape and not just coastal resources, a focus on rescue of archaeological sites under threat by coastal change, and expansion of underwater archaeological explorations in combination with submarine\ud geomorphology. This article presents a collaborative synthesis of data, some of which have been\ud collected and analysed by the authors, as the MEDFLOOD (MEDiterranean sea-level change and projection\ud for future FLOODing) community, and highlights key sites, data, concepts and ongoing debates

Current fossil, genetic, and archeological data indicate that Homo sapiens originated in Africa in the late Middle Pleistocene. By the end of the Late Pleistocene, our species was distributed across every continent except Antarctica, setting the foundations for the subsequent demographic and cultural changes of the Holocene. The intervening processes remain intensely debated and a key theme in hominin evolutionary studies. We review archeological, fossil, environmental, and genetic data to evaluate the current state of knowledge on the dispersal of Homo sapiens out of Africa. The emerging picture of the dispersal process suggests dynamic behavioral variability, complex interactions between populations, and an intricate genetic and cultural legacy. This evolutionary and historical complexity challenges simple narratives and suggests that hybrid models and the testing of explicit hypotheses are required to understand the expansion of Homo sapiens into Eurasia.

The role of coastal regions and coastlines in the dispersal of human populations from Africa and across the globe has been highlighted by the recent polarisation between coastal and interior models. The debate has been clouded by the use of the single term 'coastal dispersal' to embrace what is in fact a wide spectrum of possibilities, ranging from seafaring populations who spend most of their time at sea living off marine resources, to land-based populations in coastal regions with little or no reliance on marine foods. An additional complicating factor is the fact of Pleistocene and early Holocene sea-level change, which exposed an extensive coastal region that is now submerged, and may have afforded very different conditions from the modern coastal environment. We examine these factors in the Arabian context and use the term 'Blue' to draw attention to the fertile coastal rim of the Arabian Peninsula, and to the now submerged offshore landscape, which is especially extensive in some regions. We further emphasise that the attractions of the coastal rim are a product of two quite different factors, ecological diversity and abundant water on land, which have created persistently 'Green' conditions throughout the vagaries of Pleistocene climate change in some coastal regions, especially along parts of the western Arabian escarpment, and potentially productive marine environments around its coastline, which include some of the most fertile in the world.We examine the interplay of these factors in the Southwest region of Saudi Arabia and the southern Red Sea, and summarise some of the results of recent DISPERSE field investigations, including survey for Palaeolithic sites on the mainland, and underwater survey of the continental shelf in the vicinity of the Farasan Islands.We conclude that coastlines are neither uniformly attractive nor uniformly marginal to human dispersal, that they offer diverse opportunities that were spatially and temporally variable at scales from the local to the continental, and that investigating Blue Arabia in relation to its episodically Green interior is a key factor in the fuller understanding of longterm human population dynamics within Arabia and their global implications.2

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During the past decade, over 3000 shell middens or shell matrix deposits have been discovered on the Farasan Islands in the southern Red Sea, dating to the period c. 7,360 to 4,700 years ago. Many of the sites are distributed along a palaeoshoreline which is now 2–3 m above present sea level. Others form clusters with some sites on the shoreline and others located inland over distances of c. 30 m to 1 km. We refer to these inland sites as ‘post-shore’ sites. Following Meehan, who observed a similar spatial separation in shell deposition in her ethnographic study of Anbarra shellgathering in the Northern Territory of Australia, we hypothesise that the shoreline sites are specialised sites for the processing or immediate consumption of shell food, and the post-shore sites are habitation sites used for a variety of activities. We test this proposition through a systematic analysis of 55 radiocarbon dates and measurement of shell quantities from the excavation of 15 shell matrix sites in a variety of locations including shoreline and post-shore sites. Our results demonstrate large differences in rates of shell accumulation between these two types of sites and selective removal of shoreline sites by changes in sea level. We also discuss the wider implications for understanding the differential preservation and visibility of shell-matrix deposits in coastal settings in other parts of the world extending back into the later Pleistocene in association with periods of lowersea level. Our results highlight the importance of taphonomic factors of post-depositional degradation and destruction, rates of shell accumulation, the influence on site location of factors other than shell food supply, and the relative distance of deposits from their nearest palaeoshorelines as key variables in the interpretation of shell quantities. Failure to take these variables into account when investigating shells and shell-matrix deposits in late Pleistocene and early Holocene contexts is likely to compromise interpretations of the role and significance of shell food in human evolutionary and socio-cultural development.