The gateway area is located at the southeast corner of Mound E and is part of a mudbrick perimeter wall that was first recognized in 1990. The bastion area consists of a Period 3B (2450-2200 B.C.) wall built upon a Period 3A (2600-2450 B.C.) wall, with a major repair encompassing the exterior and some of the interior of the Period 3A wall. Where the perimeter wall turns from an east-west orientation on the southern part of Mound E to a north-south orientation on the eastern side of Mound E, a corner bastion was constructed. A four meter wide street adjacent to the perimeter wall's interior sets apart the wall from the habitation area. This street appears to have been in use throughout the wall's existence.
The entrance street is approximately 2.6 meters wide during its initial phase of construction and would have been the main entrance into this part of the city, running along the edge of the Mound E perimeter wall. During the last phase of construction, it appears that the gateway was partially blocked and the large corbel-arch drain dug through its center, running north-south along the alignment of the old street. At this time, two north-south streets led north from the gateway area with the drain running between them. These streets were joined just inside the gateway area by a street running east-west across the corbelled culvert of drain. There may have been some traffic through the gateway along narrow passages still present at the edge of the drain. It would not have been possible to bring large carts through the gateway unless the entire drain exit was covered with wooden beams (as was done with the wooden covering for the water chamber at the corbelled drain exiting the Great Bath at Mohenjodaro).