Denevan’s monograph is focused on the earthworks constructed by the aborigines of the Llanos de Mojos as their way of dealing with seasonal flooding. The data were gathered through fieldwork and through library and archival research. The author provides many detailed descriptions of the various earthworks in the Mojos, supplemented with some very illustrative photographs. These earthworks are discussed as settlement, communication, and agricultural features, with smaller typologies under each of these. I found some of these lesser typologies to be confusing, for the criteria used do not appear to be consistent. For example, under settlement features he writes of artificial mounds, artificial islas, and house mounds. Denevan presents the archaeological, historical, contemporary, and world context of these earthworks in separate chapters. He also fits his discussion of the population of the Mojos into current research on the aboriginal population of the New World.

Typographical errors are few. I was somewhat confused by Denevan’s switching from feet to meters in a single context (p. 12). Because of his frequent use of non-English words—often not italicized—a glossary would have helped. Although lakes appear prominently in Figures 2, 3, and 4, they are not identified as such in the keys accompanying these figures.

Denevan has added to our knowledge of the Llanos de Mojos in publishing these data. As a result of his research, one gains a much better view of the variety in form and function and the very impressive size and extent of the various earthworks. The biggest gaps in our knowledge of this area are of an archaeological nature, and Denevan has provided a very meaningful context for pursuing such research. It is hoped that more archaeologists will join Donald Lathrap and the others working in this general area and make this needed contribution.