The Judaean Desert is a desert in Israel and the West Bank that lies east of Jerusalem and descends to the Dead Sea. It stretches from the northeastern Negev to the east of Beit El, and is marked by terraces with escarpments. It ends in a steep escarpment dropping to the Dead Sea and the Jordan Valley. The Judaean Desert is crossed by numerous wādis from northeast to southeast, and has many nahals, most of them deep, from 1,200 feet in the west to 600 feet in the east. Judaean Desert is an area with a special morphological structure along the east of the Judaean Mountains.

The Dead Sea, also called the Salt Sea, is a salt lake bordering Jordan to the east and Israel and the West Bank to the west. Its surface and shores are 423 metres (1,388 ft) below sea level, Earth's lowest elevation on land. The Dead Sea is 377 m (1,237 ft) deep, the deepest hypersaline lake in the world. With 33.7% salinity, it is also one of the world's saltiest bodies of water, though Lake Assal (Djibouti), Garabogazköl and some hypersaline lakes of the McMurdo Dry Valleys in Antarctica (such as Don Juan Pond) have reported higher salinities. It is 8.6 times saltier than the ocean. This salinity makes for a harsh environment in which animals cannot flourish, hence its name. The Dead Sea is 67 kilometres (42 mi) long and 18 kilometres (11 mi) wide at its widest point. It lies in the Jordan Rift Valley, and its main tributary is the Jordan River.

Masada is the name for a site of ancient palaces and fortifications in the Southern District of Israel, on top of an isolated rock plateau, or horst, on the eastern edge of the Judaean Desert, overlooking the Dead Sea. Masada is best known for the violence that occurred there in the first century CE. In the final accords of the First Jewish–Roman War, the Siege of Masada by troops of the Roman Empire led to the mass suicide of the Sicarii rebels. Masada is located at 31°18'56"N, 35°21'14"E, about 20 kilometres (12 mi) east of Arad.
The cliffs on the east edge of Masada are about 1,300 feet (400 m) high and the cliffs on the west are about 300 feet (91 m) high; the natural approaches to the cliff top are very difficult. The top of the plateau is flat and rhomboid-shaped, about 1,800 feet (550 m) by 900 feet (270 m). There was a casemate wall around the top of the plateau totaling 4,300 feet (1.3 km) long and 12 feet (3.7 m) high, with many towers, and the fortress included storehouses, barracks, an armory, the palace, and cisterns that were refilled by rainwater. Three narrow, winding paths led from below up to fortified gates.