The Wetlands of South West Lancashire describes the results of an archaeological survey, carried out between 1993 and 1996, and of a separate palaeoecological and geomorphological programme of work initiated in 1966 by Michael Tooley. The study encompassed the main moss complexes, which lie in the area south of the Ribble Estuary, north of the Mersey Estuary, and west of the M6 motorway, and the smaller discrete mosses which are found away from the coastal situation of the larger ones. The survey identified considerable evidence of early prehistoric use of the landscape, with distinct differences between the northern and southern mosslands. The palaeoecological and geomorphological data provide information on the changing coastline in prehistory, resulting from variations in sea level, which is of immense interest today in the light of current trends in global warming and the possible concomitant rise in sea levels. These data also provide possible evidence of the early manipulation of the vegetation by humans.