On the east the valley of the Kidron separates this plateau from the ridge of the Mount of Olives, which is 100 to 200 ft.
Higher, while the Wadi Er Rababi bounds Jerusalem on the west and south, meeting the Valley of Kidron near the lower pool of Siloam.
Of the Damascus gate, followed a course first south-east and then west of south, and joined the two main valleys of Kidron and Er Rababi at Siloam.
In ancient times a brook flowed down the valley of the Kidron, and it is possible that a stream flowed also through the Tyropoeon valley.
The only known spring existing at present within the limits of the city is the "fountain of the Virgin," on the western side of the Kidron valley, but there may have been others which are now concealed by the accumulations of rubbish.