Ancient civilization that flourished between c.2,500-1,750 bc in modern s. e. pakistan in the indus river valley. archeological sites associated with this culture have been discovered throughout pakistan and n. india. the best preserved and most extensively excavated are what?

The name of this ancient civilization is Harappan and the best preserved and most extensively excavated archeological site is Mohenjo-Daro.  

Explanation:

Mohenjo-Daro was one of the largest settlements in the Indus Valley. According to the scholar Dani A.H., this site was built around the year 2500 B.C., and had a remarkably civil engineering and urban planning. Under the decline of the Harappan civilization around 1900 B.C., Mohenjo-Daro was abandoned.

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