Around 1800 BCE, signs of a gradual decline began to emerge, and by around 1700 BCE, most of the cities were abandoned.
Certain scholars propose that this was a major river during the third and fourth millennia BCE, and suggest that it may have been the Sarasvati River of the Rigveda.
In the course of the 2nd millennium BCE, remnants of the IVC's culture would (the so-called Cemetery H culture) amalgamated with that of other peoples, likely contributing to what eventually resulted in the rise of Vedic culture and eventually historical Hinduism.