=Valley of Ajalon.= Six important valleys thus lead up from the plain to the central highlands. The northernmost, and in many ways the most important, is the Valley of Ajalon. It marks the northwestern boundary of Judah. It is a great, broad, fertile plain, lying between five hundred and a thousand feet above sea-level. The stream which ultimately finds its way into the sea a little north of Joppa, here makes a broad curve to the northeast, receiving four or five small tributary streams from the highlands of Judah and southern Samaria. From this valley several roads lead up to the plateau north of Jerusalem. Of these the most important is the one that ascends the pass of the Upper and Lower Beth-horons, along which ran the most direct and, in early times, the main highway from Jerusalem to Joppa.^{(118)} =Wady Ali.= A little south of the Valley of Ajalon is the narrow Wady Ali, along which runs to-day the carriage road from Jerusalem to Joppa. Apparently because of the deepness and narrowness of this valley it does not figure in biblical history until the Maccabean period. =Valley of Sorek.= The third important gateway to Judah was the Valley of Sorek, the present Wady es-Surar. Here the modern railway from Joppa to Jerusalem penetrates the central plateau. Just before the Valley of Sorek reaches the steep ascent to the highlands it receives two important confluents, the Wady el-Ghurab, from the northwest, and the Wady en-Nagil from the south. Here the valley opens into a broad fertile plain, closely connected with the larger Plain of Philistia and yet encircled by the hills of the Shephelah. Immediately to the north was the home of the Danites and about this picturesque point gather the Samson stories. Along a winding and steep ascent the narrow pass thence runs directly eastward toward Jerusalem, approaching the city across the Valley of Rephaim from the southwest. =Valley of Elah.= The fourth valley is that of Elah, the Valley of the Terebinth, which is known to-day as the Wady es-Sunt. This valley abounds in memories of David's earlier exploits.^{(88)} Its eastern branch, the Wady el-Jindy leads through a narrow defile up toward Bethlehem. Its more important branch, the Wady es-Sur, runs directly southward past what are probably to be identified as the ancient Adullam and Keilah, and thence turning eastward, reaches the uplands near the famous Maccabean fortress of Bethzur, a little north of Hebron.