The wilderness into which the Israelites emerged is called indifferently that of Shur and Etham. Shur was the Semitic equivalent of the Egyptian Anbu or ‘Wall’ of fortification, while Etham took its name from one of the Khetemu or ‘Fortresses’ which guarded the approach to the valley of the Nile. It was a wilderness which stretched away to the shores of the Gulf of Aqaba, and the Hebrew tribes accordingly marched along it. They took, we are told, ‘the way of the wilderness of the Yâm Sûph,’ following the Haj road, which is still traversed by the pilgrims from Egypt to Mecca. But the caravan moved slowly, and for three days they could find no water. Had they turned southward into the Sinaitic peninsula, a few hours would have brought them to the Wells of Moses—now a place of picnic for the visitors to Suez,—while the road to the Egyptian mines was provided with cisterns and wells. But to have done so would have been merely to exchange Egypt for one of its strongly-garrisoned provinces. How long the wanderers were in crossing the desert we do not know; nor do we know where Marah was, whose ‘bitter’ waters refreshed them after three days of scarcity. But at last they reached the oasis of Elim, which the itinerary in the book of Numbers (xxxiii. 10) couples with the Yâm Sûph. Elim, in fact, is but a variant form of Elath,[191] and Elath is the Aila of classical geography, of which Aqaba is the modern successor. When the Israelites left Elim a whole month had elapsed since their departure from Egypt (Exod. xvi. 1). Between Elim or the Yâm Sûph[192] and Mount Sinai lay the Wilderness of Sin. Sinai and Sin alike derived their names from Sin, the moon-god of Babylonia, whose worship had long since been brought by Babylonian conquest to the West. More than two thousand years before the Exodus the Babylonian conqueror, Naram-Sin, ‘the beloved of Sin,’ had carried his arms as far as the Sinaitic peninsula, and the inscriptions of Southern Arabia show that there also the Babylonian deity was adored.[193] It would seem probable that a temple dedicated to his service stood on the slopes of Mount Sinai. Numerous attempts have been made to identify the mountain which the Israelites regarded as the scene of the first pronouncement of their Law. Most of these attempts are based on the belief that it is to be sought in the Sinaitic peninsula. The rival claims of Jebel el-’Ejmeh, Jebel Umm ’Alawî, Jebel Zebîr-Katarîna, Jebel Serbâl, and Jebel Mûsa have all been eagerly discussed. Jebel Mûsa alone can claim the support of tradition, though this does not go back further than the third or fourth century A.D., when the Christian hermits first settled in its neighbourhood. The Sinai of S. Paul and Josephus was still in the Arabia of Roman geography, the kingdom of which Petra was the capital.