<Table> Indus Valley Civilisation <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Geographical range </Th> <Td> South Asia </Td> </Tr> <Tr> <Th> Period </Th> <Td> Bronze Age </Td> </Tr> <Tr> <Th> Dates </Th> <Td> c. 2600--c. 1900 BCE </Td> </Tr> <Tr> <Th> Preceded by </Th> <Td> Mehrgarh </Td> </Tr> <Tr> <Th> Followed by </Th> <Td> Vedic period </Td> </Tr> </Table> <Tr> <Th> Geographical range </Th> <Td> South Asia </Td> </Tr> <Tr> <Th> Period </Th> <Td> Bronze Age </Td> </Tr>

Why do we call the harappan civilization the first civilization in india