Overview of Harappa Mound AB, Trench 39N, showing the Kot Diji phase levels in the foreground and the Harappa phase levels above, beginning with a baked brick drain (on the far left) and ending with the brick wall that can be seen just behind and above the drain at the top of the excavated area. The Harappa phase levels are not much more than 2.5 meters thick in this part of the site.