Al-Karak lies 140 kilometers (87 mi) to the south of Amman on the ancient King’s Highway. It is situated on a hilltop about 1,000 meters (3,300 ft) above sea level and is surrounded on three sides by a valley. Al-Karak has a view of the Dead Sea. A city of about 20,000 people has been built up around the castle and it has buildings from the 19th-century Ottoman period. The town is built on a triangular plateau, with the castle at its narrow southern tip.
Al-Karak has been inhabited since at least the Iron Age, and was an important city for the Moabites. In the Bible it is called Qer Harreseth or Kir of Moab, and is identified as having been subject to the Assyrian empire; in the Books of Kings (16:9) and Book of Amos (1:5, 9:7), it is mentioned as the place where the Syrians went before they settled in the regions in the northern of Levant, and to which Tiglath-Pileser III sent the prisoners after the conquest of Damascus. In 1958 the remains of an inscription was found in Wadi al-Karak that has been dated to the late 9th century BC.