Explanation:

Harappa is an archaeological site in Punjab, Pakistan, about 24 km (15 mi) west of Sahiwal. The site takes its name from a modern village located near the former course of the Ravi River which now runs 8 km (5.0 mi) to the north. Indus Valley civilization was mainly an urban culture sustained by surplus agricultural production and commerce, the latter including trade with Sumer in southern Mesopotamia. Both Mohenjo-Daro and Harappa are generally characterized as having "differentiated living quarters, flat-roofed brick houses, and fortified administrative or religious centers.