Dr. S. Kalyanaraman discusses in detail the cultural framework governed by geology and the polity of Janapadas. He talks about the ancient migrations and the routes of traditional settlements through out Sarasvati-Sindhu basin.
People travelled for various reasons, the alluvial productive rich soil, the emergence of the tirtha sthals on the banks of rivers, the trade contacts of different parts of the country. He insists that the entire country should be studied as a whole to understand its civilization and the riches that made it globally known resulting into lot of trade activities across the globe. The religious movements and the culture of ancient India continues till the present day.