Difficulty of access has prevented the Dead Sea from playing any important part in history except as an obstruction both to commerce and to military movements. Boats have never been used upon it to any considerable extent. From earliest times salt has been gathered on its western shores and carried up to market over the difficult paths leading to Jerusalem. A similar commerce has been carried on in bitumen; that from the Dead Sea being specially prized in Egypt, while as already remarked, it is by no means improbable that the pits of bitumen which abounded in the "Vale of Siddim" were the chief attraction leading the kings of Babylonia to undertake long expeditions for the conquest of the region. Productive as may have been the plain at the South end of the sea, it was too far outside the caravan route leading through Petra to the South end of the Arabah and the mines of the Sinaitic Peninsula to divert the course of travel. Still the settlements on the eastern border of the Vale of Siddim were of sufficient importance in medieval times to induce the Crusaders to visit the region and leave their marks upon it. The Arabian town of Zoghar, probably the Biblical Zoar, appears at one time to have been a most important place, and was the center of considerable commercial activity. Indigo was grown there, and the oasis was noted for its fine species of dates. The country round about abounded in springs and there was much arable land (see Le Strange, Palestine under the Moslems, 286 ff). The hot springs upon the eastern shore of the Dead Sea at Callirrhoe some distance up the Wady Zerka Ma'ain were much resorted to for their medicinal properties. Here Herod came as a last resort, to secure relief from his loathsome malady, but failed of help. The fortress of Macherus, where John the Baptist was imprisoned, is situated but a few miles South of the Zerka Ma'ain, but access to this region is possible only through a difficult road leading over the mountains a few miles East of the sea.
On four occasions important military expeditions were conducted along the narrow defiles which border the Southwest end of the Dead Sea: (1) That of Amraphel and his confederates from Babylonia, who seem first to have opened the way past Petra to the mines of the Sinaitic Peninsula, and then to have swept northward through the land of the Amalekites and Amorites and come down to the Dead Sea at En-gedi, and then to have turned to subdue the Cities of the Plain, where Lot was dwelling. This accomplished, they probably retreated along the west shore of the lake, which very likely afforded at that time a complete passageway to the valley of the Jordan. Or they may have gone on eastward to the line of the present pilgrim route from Damascus to Mecca and followed it northward. (2) In the early part of the reign of Jehoshaphat (2Ch 20:1-37), the Moabites, Ammonites and some other tribes joined together, forming a large army, and, following around the South end of the Dead Sea, marched along the West shore to En-gedi, and having ascended the zigzag path leading up the precipitous heights to the wilderness of Tekoa, were there thrown into confusion and utterly annihilated. (3) Not many years later Jehoram and Jehoshaphat "fetched a compass (the Revised Version (British and American) "made a circuit") of seven days' journey" (2Ki 3:9) around the South end of the Dead Sea and attacked the Moabites in their own country, but returned without completing the conquest. The particulars of this expedition are given in 2Ki 3:1-27 and in the inscription on the Moabite Stone. (4) The Romans shortly after the destruction of Jerusalem conducted a long siege of the fortress of Masada, of which an account has already been given in a previous section (VII, 3). All their supplies must have come down the tortuous path to En-gedi and thence been brought along the western shore to the camp, the remains of which are still to be seen at the base of the fortress.
For many centuries, indeed for nearly 1,800 years, the Dead Sea remained a mystery, and its geology and physical characteristics were practically unknown. The first intimation of the depression of the lake below sea level was furnished in 1837 by Moore and Beke, who made some imperfect experiments with boiling water from which they inferred a depression of 500 ft. In 1841 Lieutenant Simmons of the British navy, by trigonometrical observations, estimated the depression to be 1,312 ft. In 1835. Costigan, and again in 1847 Lieutenant Molyneux ventured upon the sea in boats; but the early death of both, consequent upon their exposures, prevented their making any full reports. Appropriately, however, their names have been attached to prominent points on the Lisan. In 1848 Lieutenant Lynch, of the United States navy, was dispatched to explore the Jordan and the Dead Sea. The results of this expedition were most important. Soundings of the depths were carefully and systematically conducted, and levels were run from the Dead Sea by Jerusalem to the Mediterranean, giving the depression at the surface of the Dead Sea as 1,316,7 ft., and its greatest depth 1,278 ft. More recently Sir C. W. Wilson in connection with the Ordinance Survey of Palestine carried levels over the same route with the result of reducing the depression to 1,292 ft., which is now generally accepted to be correct. But as already stated the stage of water in the lake is not given, and that is known to vary at least 15 ft. annually, and still more at longer intervals.
LITERATURE.
Hull, Mount Seir, Sinai and Western Palestine, 1889; Huntington, Palestine and Its Transformation, 1911; Lartet, Voyage d'exploration de la Mer Morte, 1880; Lynch, Report of U.S. Expedition to the Jordan and Dead Sea, 1852; Robinson, BR, 1841; De Saulcy, Voyage dans la Syrie, 1853; Tristram, Land of Israel, 2nd edition, 1872, The Land of Moab, 1873; G. A. Smith, HGHL; Wright; Scientific Confirmations of Old Testament Hist, 1906, and Journal of Biblical Lit., 1911.
George Frederick Wright