Dacia, the frontier of the Roman Empire
<p>From 500 BC, the Roman Empire began to gradually expand its territory into Europe and North Africa. By the 2nd century AD, the total length of the border reached about 7,500 kilometers. The Romanian section, the Dacia border, was in normal operation from 106 to 271 AD. The heritage site consists of 277 parts and is the longest and most complex land border of a former Roman province in Europe. It crosses different landforms and connects legionary forts, auxiliary forts, earthen walls, watchtowers, temporary camps, and secular buildings into a network. Dacia is the only province of ancient Rome located entirely on the north bank of the Danube. Its borders not only protected the hinterland from "barbarians" but also controlled access to valuable resources such as gold and salt. </p>