Mountains have captured the interests and passions of people for thousands of years. Today, millions of people live within mountain regions, and mountain regions are often areas of accelerated environmental change. This edited volume highlights new understanding of mountain environments and mountain peoples around the world. The understanding of mountain environments and peoples has been a focus of individual researchers for centuries; more recently the interest in mountain regions among researchers has been growing rapidly. The articles contained within are from a wide spectrum of researchers from different parts of the world who address physical, political, theoretical, social, empirical, environmental, methodological, and economic issues focused on the geography of mountains and their inhabitants. The articles in this special issue are organized into three themed sections with very loose boundaries between themes: (1) physical dynamics of mountain environments, (2) coupled human-physical dynamics, and (3) sociocultural dynamics in mountain regions. This book was first published as a special issue of the Annals of the American Association of Geographers.