Answer :
A common characteristic of cities large and small in the Indus valley more than 4,000 years ago was : the location of a raised area or "citadel" dominating the city, their precisely planned nature with parallel and perpendicular streets craft specialist neighborhoods.
The Indus Civilization, also called the Indus Valley Civilization or the Harappan Civilization, the oldest known urban culture of the Indian subcontinent. Nuclear dates for the civilization appear to be about 2500–1700 BC, although the southern sites may have lasted later to the 2nd millennium BC.
The Indus cities are known for their urban planning, technical and political processes dealing with land use and the design of the urban environment. They are also known for their burnt brick houses, elaborate sewage systems, water supply systems and clusters of large non-residential buildings.
The Indus Civilization spread over the vast territory of modern Afghanistan, Pakistan, and northwest India. At its peak, around 2500 BC, there were more than 2,000 cities scattered across the plains of the Indus Valley region. Harappa and Mohenjodaro were the largest of these.
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