The subject of the book is a synthesis of theoretical developments concerning river processes and forms in drylands - the semiarid, arid, and extremely arid portions of the earth's surface. The work describes the present understanding of dryland rivers, using a theoretical framework with examples and results of research from many areas of the world. The most important feature of this book is that it represents the first organized review of the knowledge about dryland rivers. Information on practical management and planning is also included. The book is unique in that it stresses the philosophical and methodological aspects of geomorphologic research, rather than merely reporting results. Scientists may expect to use the work frequently as a guide to the literature, an intellectual review of previous ideas in the field, and an indication of where further work is needed. Planners and decision makers in dryland regions may expect to use the book as an entré to the science of geomorphology as applied to dryland environments.