 Borders of the Roman Empire

The borders of the Roman Empire, which fluctuated throughout the empire's history, were realised as a combination of military roads and linked forts, natural frontiers (most notably the Rhine and Danube rivers) and man-made fortifications which separated the lands of the empire from the countries beyond.The word "limes" is sometimes used by modern scholars to denote the frontier of the Roman Empire but was not used by the Romans as such.