What is a common characteristic of most Harappan settlements?

Small high western part and large lower eastern section

Although the majority of Harappan settlements exhibit a common layout with a smaller elevated western part and a larger lower eastern section, there exist variations in some sites. Dholavira and Lothal, located in Gujarat, stand out as examples where the entire settlements were fortified, and additional walls separated different sections within the towns. While the Citadel in Lothal was not enclosed by walls, it was constructed at an elevated height.