Coordinates: 31°25′57″N 35°20′34″E / 31.432607°N 35.342913°E
The Cave of Letters is a cave in Nahal Hever in the Judean Desert where letters and fragments of papyri from the Roman Empire period were found. Some are related to the Bar Kokhba revolt (circa 131-136), including letters of correspondence between Bar-Kokhba and his subordinates. Another notable bundle of papyri, known as the Babatha cache, comprises legal documents of Babatha, a female landowner of the same period.
The cave is located at the head of Nahal Hever in the Judean desert, about 40 kilometres (25 mi) south of Qumran, 20 km south of Wadi Murabba'at. The site is a few kilometers southwest of En-gedi, approximately 10 kilometers north of Masada, on the western shore of the Dead Sea. The cave has two openings, three halls and some crevices.
The cave was discovered by Bedouin of the Ta`amireh tribe and explored in 1953 and 1955 by inspector of the Israel Department of Antiquities, Yohanan Aharoni. In 1953, after the sale of letters written by Bar-Kokhba found in the caves of Wadi Murabba'at, an expedition was organized to explore these caves. However the expedition first visited Nahal Hever, where the team noticed remnants of a Roman siege camp directly above the Cave of Letters. Another camp was also discovered on the southern side of the ravine.