Isolated on a high hillock in the middle of Lake Nasser, the monumental complex of Qasr Ibrim displays a collection of archaeological remnants of Egypt's various historical epochs that once witnessed a unique civilisation.
Qasr Ibrim was once an eagle's nest over Lower Nubia but is now an island, or at times a peninsula, on the east bank of the artificial Lake Nasser which came into being after the building of the Aswan High Dam in the early 1960's. The site was intermittently inhabited from as early as the Middle Kingdom until the 1840's. It also functioned as a military stronghold and a destination of religious pilgrimage for various armies and religious denominations.
Good long article.