Masada (Hebrew: מצדה metsada, "fortress") is an ancient fortification in the Southern District of Israel situated on top of an isolated rock plateau, akin to a mesa. It is located on the eastern edge of the Judaean Desert, overlooking the Dead Sea 20 km (12 mi) east of Arad. Herod the Great built two palaces for himself on the mountain and fortified Masada between 37 and 31 BCE. According to Josephus, the siege of Masada by Roman troops from 73 to 74 CE, at the end of the First Jewish–Roman War, ended in the mass suicide of the 960 Sicarii rebels who were hiding there. Masada is one of Israel's most popular tourist attractions. The cliff of Masada is, geologically speaking, a horst. As the plateau abruptly ends in cliffs steeply falling about 400 m (1,300 ft) to the east and about 90 m (300 ft) to the west, the natural approaches to the fortress are very difficult to navigate. The top of the mesa-like plateau is flat and rhomboid-shaped, about 550 m (1,800 ft) by 270 m (890 ft). Herod built a 4 m (13 ft) high casemate wall around the plateau totalling 1,300 m (4,300 ft) in length, reinforced by many towers. The fortress contained storehouses, barracks, an armory, a palace, and cisterns that were refilled by rainwater. Three narrow, winding paths led from below up to fortified gates. Almost all historical information about Masada comes from the first-century Jewish Roman historian Josephus.