This book written by world renowned Archaeologist Dr. Siran Deraniyagala, former Director-General of Archaeology, comprises of a summary of investigations into the Prehistoric environment of Sri Lanka based on his “The Prehistory of Sri Lanka: an ecological perspective” in light of new evidence. This book synthesizes environmental and cultural data, both present and past, into a set of hypotheses involving the systemic interaction of prehistoric culture and environment, to be tested in the next mega-stage of the research design.