(Info about the walls, measurements included)
The space between the walls (near about 60 feet/18 metres) is the same. It is enough for a deep dry ditch that would make setting anything up for the assault on the next wall harder and two roads running along the walls for people trying to enter the city.
The ditch is 20 ft/6 metres wide and deep enough to break a few bones if not your back/neck. There are 20 ft wide, paved roads running right along the walls, and there is a titan stone guardrail 20 inches high from the edge of the road to protect or at least warn any carriages, carts or men from falling to their doom. The distance between the three walls is the same however their height and individual width and mass is different. The first is shorter and less wider than the second. The second is less wider and taller than the third. The third is the widest and the tallest.
After entering through the first gate, you must walk to the right (southward) across the road and then cross the second drawbridge, pass through the gate and then walk left (northward) until you reach the third drawbridge and gate.