As a matter of fact part of the great wall, which surrounded the city from the Neo-Babylonian period onward, has survived to the present day, and may still be recognized in a low ridge of earth, or series of consecutive mounds,[19] which cross the plain for a considerable distance to the south-east of Babil. The traveller from Baghdad, after crossing the present Nîl Canal by a bridge,[20] passes through a gap in the north-eastern wall before he sees on his right the isolated mound of Bâbil with the extensive complex of the Ḳaṣr and its neighbour, Tell 'Amrân-ibn-'Ali, stretching away in front and to his left.[21] The whole length of the city-wall, along the north-east side, may still be traced by the position of these low earthen mounds, and they prove that the city on this side measured not quite two and three-quarter miles in extent. The eastern angle of the wall is also preserved, and the south-east wall may be followed for another mile and a quarter as it doubles back towards the Euphrates. These two walls, together with the Euphrates, enclose the only portion of the ancient city on which ruins of any importance still exist. But, according to Herodotus and other writers, the city was enclosed by two similar walls upon the western bank, in which case the site it occupied must have formed a rough quadrangle, divided diagonally by the river. No certain trace has yet been recovered of the western walls,[22] and all remains of buildings seem to have disappeared completely on that side of the river. But for the moment it may be assumed that the city did occupy approximately an equal amount of space upon the western bank; and, even so, its complete circuit would not have extended for more than about eleven miles, a figure very far short of any of those given by Herodotus, Ctesias and other writers. [Illustration: FIG. 3. PLAN OF THE RUINS OF BABYLON. A: The mound Babil. B: Outer City-wall. C: Inner City-wall. D: The Ḳaṣr mound. E: The mound 'Amrân-ibn-'Ali. F: E-makh, temple of the goddess Ninmakh. G: Temple of Ishtar of Akkad. H: E-tomen-anki, the Tower of Babylon. I: Ancient bed of the Euphrates. J: The mound Merkes. K: E-sagila, the temple of Marduk. L: The mound Ishin-aswad. M: Unidentified temple known as "_Z._" N: E-patutila, the temple of Ninib. P: Greek theatre. Q: Sakhn, the small plain covering the precincts of the Tower of Babylon. R: The mound Homera. S: Nîl Canal. T: Bridge over Nîl Canal. U: Former bed of Nîl Canal. V: Old Canal. W: Euphrates. X: Track from Baghdad to Hilla. Z: Mounds covering the ruins of walls. I: Village of Anana. 2: Village of Kweiresh. 3: Village of Jumjumma. 4: Village of Sinjar. (After Koldewey and Andrae.)]