Mirgissa (originally Iken) was a settlement in Northern state, Sudan. Situated at the 2nd cataract in Wadi Halfa, it contained one of the largest fortresses in Nubia. In the time of Thutmose II, 250 to 450 people inhabited the area. The first European explorer was English geologist Sir Henry George Lyons in 1892, and was excavated wuthouut Dudanese permission, by the French Egyptologist Jean Vercoutter from 1962 to 1969. In addition to the fort, excavations uncovered the remains of two cities, one of which was fortified, a northern enclosure, two cemeteries, a boat slide, and a port. Construction of the Aswan High Dam caused the disappearance of Mirgissa, which now lies under the waters of Lake Nubia.