The fortress itself extended more than along the west bank of the Nile. It covered , and had within its wall a small town laid out in a grid system. At its peak it probably had a population of around 3,500 people. The fortress also included the administration for the whole fortified region of the Second Cataract. Its fortifications included a moat three meters deep, drawbridges, bastions, buttresses, ramparts, battlements, loopholes, and a catapult. The outer wall included an area between the two walls pierced with a double row of arrow loops, allowing both standing and kneeling archers to fire at the same time. The walls of the fort were about thick and high. The walls of Buhen were crafted with rough stone. The walls of Buhen are unique as most Egyptian fortress walls were constructed with timber and mud-brick. The fortress at Buhen is now submerged under Lake Nasser as a result of the construction of the Aswan Dam in 1964. Before the site was covered with water, it was excavated by a team led by Walter Bryan Emery.