borders of the Roman Empire
United Kingdom · Europe
關於
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.
內容改寫自 Wikipedia (CC BY-SA)。照片來自 Wikimedia Commons.