Limes (Roman Empire) - Credit: Wikimedia Commons
(Latin; , : ) is a modern term used primarily for the Germanic border defence or delimiting system of Ancient Rome marking the borders of the Roman Empire, but it was not used by the Romans for that purpose.Benjamin Isaac, "The Meaning of 'Limes' and 'Limitanei' in Ancient Sources", Journal of Roman Studies, 78 (1988), pp. 125–147Great Walls and Linear Barriers, Peter Spring, Pen and Sword, 2015, Chap. 24. , 9781473853843 The term has been extended to refer to the frontier defences in other parts of the empire, such as in the east and in Africa. Read more on Wikipedia
Source: en.wikipedia.org