"Dales, who excavated Balakot, suggested that ‘a sudden rise in the Arabian Sea coastline of West Pakistan apparently took place sometime around the middle of the second millennium. This resulted in a disastrous increase in the already serious floods in the major river valleys. ... The Harappans were forced to migrate gradually to more fertile territory. There is now incontrovertible archaeological evidence that the major population shift was to the southeast into the area of the Kathiawar [= Saurashtra] peninsula....’"