Buhen was an ancient Egyptian settlement situated on the West bank of the Nile below the Second Cataract. On the East bank, across the river, was located an ancient settlement of Wadi Halfa. Buhen is known for its large fortress, probably constructed during the rule of Senusret III in around 1860 BC (12th dynasty). Senusret III conducted four campaigns into Kush and established a line of forts within signalling distance of one another; Buhen was the northernmost of these. The other forts along the banks were Mirgissa, Shalfak, Uronarti, Askut, Dabenarti, Semna, and Kumma. The fortress at Buhen is now submerged under Lake Nasser as a result of the construction of the Aswan Dam in 1964.