179. I must also tell in addition to this for what purpose the earth was used, which was taken out of the trench, and in what manner the wall was made. As they dug the trench they made the earth which was carried out of the excavation into bricks, and having moulded enough bricks they baked them in kilns; and then afterwards, using hot asphalt for mortar and inserting reed mats at every thirty courses of brickwork, they built up first the edges of the trench and then the wall itself in the same manner: and at the top of the wall along the edges they built chambers of one story facing one another; and between the rows of chambers they left space to drive a four-horse chariot. In the circuit of the wall there are set a hundred gates made of bronze throughout, and the gate-posts and lintels likewise. Now there is another city distant from Babylon a space of eight days' journey, of which the name is Is; and there is a river there of no great size, and the name of the river is also Is, and it sends its stream into the river Euphrates. This river Is throws up together with its water lumps of asphalt in great abundance, and thence was brought the asphalt for the wall of Babylon. 180. Babylon then was walled in this manner; and there are two divisions of the city; for a river whose name is Euphrates parts it in the middle. This flows from the land of the Armenians and is large and deep and swift, and it flows out into the Erythraian sea. The wall then on each side has its bends 179 carried down to the river, and from this point the walls stretch along each bank of the stream in the form of a rampart of baked bricks: and the city itself is full of houses of three and four stories, and the roads by which it is cut up run in straight lines, including the cross roads which lead to the river; and opposite to each road there were set gates in the rampart which ran along the river, in many in number as the ways, 180 and these also were of bronze and led like the ways 181 to the river itself.