There is evidence for the intensification of subsistence practice, multicropping and the adoption of new forms of transportation (camel and horse). T… - Jonathan Mark Kenoyer

In the east, the ancient Saraswati (or Ghaggar-Hakra) river ran parallel to the Indus . . . Towards the end of the Indus Valley civilization, the ancient Saraswati had totally dried up and its original tributaries were captured by two other mighty rivers . . . The gradual drying up of the Saraswati river is an event documented both geologically as well as in the sacred Vedic and Brahmanical literature of ancient India . . . Many episodes of the Rig-Veda take place along the sacred Saraswati.

Sites such as Harappa continued to be inhabited and are still important cities today. . . . Late and post-Harappan settlements are known from surveys in the region of Cholistan, . . . the upper Ganga-Yamuna Doab,. . . and Gujarat. In the Indus Valley itself, post-Harappan settlement patterns are obscure, except for the important sites of Pirak. . . . This may be because the sites were along the newly-stabilized river systems and lie beneath modern villages and towns that flourish along the same rivers.

There is no archaeological or biological evidence for invasions or mass migrations into the Indus Valley between the end of the Harappan Phase, about 1900 B.C. and the beginning of the Early Historic period around 600 B.C.