Presents paleogeographic maps of the central and western Mediterranean for 18,000 BP at the height of the last glacial maximum, and for 9,000 BP near the end of the rapid phase of the postglacial rise of the sea. Sea-level data for the past 125,000 years indicate that, in addition, the 18,000 BP map reasonably represents preceding cold stadials, while the 9,000 BP map depicts the configuration of intervening warm periods. The presence of large coastal plains during low stands of the sea has long been known, but their exact contours, sizes, and dates have not been widely available. Moreover, some of these coastal plains were well watered and formed important environmental components at low sea level whose existence could not have been inferred from the nature of the adjacent coasts today. Some archaeological consequences of environmental reconstructions not evident from present-geography are indicated, though not elaborated here. See also AATA 20-1486 for earlier study. -- AATA