=Highway Through Moab.= The fourth road ran directly north from Petra across deep gorges and over rocky roads through Shôbek, et-Tufileh, Kerak and northward, following a straight course about eighteen miles to the east of the Dead Sea. This was the main highway through the heart of Moab. Farther north it ran past the famous Moabite towns of Dibon and Medeba. At Heshban, opposite the northern end of the Dead Sea, a branch turned westward to the lower ford of the Jordan, while the main road ran north along the eastern side of the Jordan until it joined the Damascus road south of the Sea of Galilee. At Heshban another important branch turned to the northeast and, passing through Rabbath-Ammon, joined the desert road to Damascus. In later times the Romans, to protect their east-Jordan border cities, built a magnificent road from Rabbath-Ammon to Petra, following the ancient highway through the heart of Moab. Mile-stones, great rock-cuttings, ruins of stone bridges, and miles of stone pavement still remain to bear testimony to Rome's strength in the distant provinces even during the period of the empire's decline. =The Great Desert Highway.= The chief highway from the south to the north was the present pilgrim road from Damascus to Mecca, along which now runs the modern Turkish railway. This road was the main connecting link between Arabia and the lands of the eastern Mediterranean. Making a wide détour westward to touch the port of Elath, it then turned to the northeast of Petra and ran along the desert highland between thirty and forty miles to the east of the Jordan and Dead Sea valley. It crossed the dry, open desert, strewn at many points with débris of black basaltic rocks. Like most desert roads it sprawled out over the hot plains, unconfined by fields or mountain passes. The stations were simply stopping-places for travellers and traders, for it everywhere avoided the cultivated land, except where its western branch passed through the heart of the Hauran on its way to Damascus. Here it ran close to the important cities of Edrei, the famous fortress on the upper Yarmuk, and Ashteroth-Karnaim. A little northeast of Rabbath-Ammon one branch, deflected to the northeast, and passing through the desert town of Bozrah, and thence skirting the eastern side of the lava tract of El-Lejah, reached Damascus. From Edrei and Bozrah a caravan route ran southeast to the ancient Duma, the present Dumat el-Jandal, and on to the oasis of Tema.