The eroding wells and a wall built up against the granary show that much of the area to the north of the granary was filled with debris and later buildings.
Ancient Indus walls.
Built on top of a tapered brick platform, this building had a solid brick foundation that extended for 50 meters east west and 27 meters north south.
Narrow brick walls define the outlines of a small room or courtyard in the low-lying area between L and SD Areas on the Citadel Mound.
One relatively successful low cost techniques used to combat the destructive nature of salts in the fired bricks is to cover the walls with a thick layer of mud and straw plaster and to spray them with clay slurry.
Structures in this part of Harappa were sometimes made of a combination of mud-bricks and baked bricks, sometimes mixed in the same wall as seen here in the case of both the southern part of the western wall and part of the northernmost wall.
Towards the east, in what was probably a low area, a series of radiating mud-brick retaining walls were built to contain rubble that was used as a foundation for later structures, only fragments of which are preserved.
Excavations during the 1997-2001 seasons were carried out inside perimeter wall . Here a partial plan of those excavations shows superimposed levels of Period 3C buildings, all mostly robbed of their baked brick walls.
Plan view of the portion of perimeter wall  excavated in 2001. The pattern of the bricks suggests a complicated series of additions to the inside of the structure that are not yet well understood.