The Harappan civilization was an ancient civilization that flourished along the Indus River in present-day Pakistan from around 3300 BC to 1700 BC. It was centered around the cities of Harappa and Mohenjo-Daro, which featured advanced architecture and urban planning including organized streets and drainage systems. The Harappan people engaged in agriculture, domesticated animals, developed trade networks, and had a literate society with skilled artisans. At its peak, the Harappan civilization was one of the most advanced ancient civilizations.