The retreat of the Aryan invasion theory has been accompanied by the rediscovery of the Sarasvati river of Vedic fame, though many scholars are still unaware of the connection of the river with the Vedas. Recent excavation has shown that the great majority of Harappan settlements were east, not west of Indus. The largest concentration of sites appears in an area of Punjab and Rajasthan along the dry banks of the Sarasvati (now called the Ghaggar) in the Thar desert. Hundreds of sites dot this river, which appears to have been the breadbasket of the culture. Mohenjodaro and Harappa, the first large Indus sites found, appear to be peripheral cities, mere gateways to the central Sarasvati region. The main sites are found in a region of northwestern India, which owing to the lack of water was never again a region of significant habitation. Hence it appears quite clearly that the sites were left owing to a shifting of the rivers and a drying out of the region which is a cause quite different than any invasion. The hand of Mother Nature is shown behind the population shift, not hostile invaders.
What is most interesting in this regard is that Vedic culture is traditionally said to have been founded by the sage Manu between the banks of the Sarasvati and Drishadvati rivers.The Sarasvati is lauded as the main river in the Rig Veda and is the most frequently mentioned river in the text. It is said to be a great flood and to be wide, even endless in size, the greatest and most central river of the region of the seven rivers. Sarasvati is said to be "pure in her course from the mountains to the sea." The Vedic people were well acquainted with this river along its entire course and regarded it as their immemorial homeland.
The Sarasvati, as modern land studies now reveals, was indeed one of the largest rivers in India in ancient times (before 1900 BC) and was perhaps the largest river in India (before 3000 BC). In early ancient and pre-historic times, it drained the Sutlej and Yamuna, whose courses were much different than they are today. However, the Sarasvati river went dry by the end of the Harappan culture and well before the so-called Aryan invasion or before 1500 BC.
