The outer boundaries of Rome should be clearly marked for both friends and foes. The Roman Empire invested significant effort in the construction of the Limites (border roads). This new work reflects, in light of the latest research findings, the intentions, origins, and functions of these border installations that extend over hundreds of kilometers, with a primary focus on the Upper Germanic-Rhaetian Limes. For practical use, this book also includes maps, indexes, and an overview of the most important museums and sites to visit.