"The frequent Rg-Vedic references to the Saraswati river are seen by both sides as a key to the solution of the Aryan question. Non-invasionists have pointed out that the biggest concentration of Harappan cities was along the Saraswati river, and that it nearly dried up synchronously with the decline of Harappan city culture. Therefore, the Rg-Veda cannot be post-Harappan..."