The Indus Valley civilization dates back at least 5,000 years to 3,000 BC and was located along the Indus River in what is now Pakistan and northwest India. The ruins of two major cities, Mohenjo-Daro and Harappa, provide evidence of well-developed urban planning and civil engineering. Agriculture, trade, and skilled crafts like pottery and jewelry making formed the economic basis of cities whose residents lived in brick houses under a system governed by priest-kings.