<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The Indus Valley Civilisation (IVC) or Harappan Civilisation was a Bronze Age civilisation (3300--1300 BCE; mature period 2600--1900 BCE) mainly in the northwestern regions of South Asia, extending from what today is northeast Afghanistan to Pakistan and northwest India . Along with Ancient Egypt and Mesopotamia, it was one of three early cradles of civilisations of the Old World, and of the three, the most widespread . </P> <P> It flourished in the basins of the Indus River, which flows through the length of Pakistan, and along a system of perennial, mostly monsoon - fed, rivers that once coursed in the vicinity of the seasonal Ghaggar - Hakra river in northwest India and eastern Pakistan . Aridification of this region during the 3rd millennium BCE may have been the initial spur for the urbanisation associated with the civilisation, but eventually also reduced the water supply enough to cause the civilisation's demise, and to scatter its population eastward . </P>

When did the indus river valley civilization exist