<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> 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> <P> At its peak, the Indus Civilisation may have had a population of over five million . Inhabitants of the ancient Indus River valley developed new techniques in handicraft (carnelian products, seal carving) and metallurgy (copper, bronze, lead, and tin). The Indus cities are noted for their urban planning, baked brick houses, elaborate drainage systems, water supply systems, and clusters of large non-residential buildings . Children's toys were found in the cities, with few weapons of war, suggesting peace and prosperity . Their trade seals, decorated with animals and mythical beings, indicate they conducted thriving trade with lands as far away as Sumer in southern Mesopotamia . </P>

What led to the end of india valley civilization