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After the formulation of the Aryan invasion theory, archeology did not
stop. New finds continued. These however have gradually
undermined the invasion theory.
Harappan civilization (3100-1900 BC) was the largest in the world up
to its time. Harappan sites have now been found as far west as to
the coast of modern Iran, as far north as Turkestan on the Amu
Darya river (a region usually identified with the Aryans), as far
northeast as the Ganges, and south to the Godavari river. A site has
even been found on the coast of Arabia. Thousands of sites have
been found with several cities, like Ganweriwala on the Sarasvati river
and Dholavira near the ocean in Kutch, as large as the first two
major cities found, Harappa and Mohenjodaro. Most sites remain
unexcavated and new explorations are likely to push the boundaries of
this civilization yet further. A civilization of this size could not have been quickly or easily overrun
by either migration or invasion.