Indus valley civilization.
Indus is a large river in eastern Pakistan, near the border of India. The Indus Valley Civilization flourished from the 4th to the middle of the 2nd century BC in the valleys of this river and its tributaries. It was one of the earliest and the biggest civilization of the world. Archaeologists found its remain in 1922. First a small part of over thousands colonies was excavated. It was the center of trade and business. Products were sent to summer in Mesopotamia. There were no magnificent buildings or temples, but a planned layout, right angled streets with living quarters, and a system for drinking and waste water were some of the things discovered here. it is not known why the civilization perished by around 1700BC