Butrint has escaped aggressive development of the type that has reduced the heritage value of most historic landscapes in the Mediterranean region. Prehistoric sites have been identified within the nucleus of Butrint, the small hill surrounded by the waters of Lake Butrint and Vivari Channel, as well as in its wider territory. In the 5th century AD Butrint became an Episcopal centre; it was fortified and substantial early Christian structures were built. In 2005, based on the Law on Protected Areas, Butrint was declared a National Park covering 86 km². To avoid threats to integrity and authenticity, monitoring and controlling the vulnerabilities are crucial issues in the Management Plan of Butrint on Archaeology and Monuments.