This topic is a very interesting topic to discuss, The Rajendra Chola I really followed the route which is parallel to the present day Eastern coast of India, which is very well confirmed by one of our Historian colleaques Shri. Orissa Balasubramanian, By following or tracing the Flora and fauna which is characteristic of Early and Middle Chola Time (ca 850- 1044 AD ) . There is no reason for Udayar Shri. Rajenra Thevar I to follow the present Day Karnataka route as it has already been conquered by himself as Dhandanayaka under His Father and Chola Emperor Udayar Sri Sri Rajaraja Chola Thevar, The Great, during Sathyasriya,s Time. I leave it to you to find out the typical Flora and fauna of Chola Era for further discussion.
G.Santhana Krishnan Scientist (DRDO) and FormerlyDy. Suptg. Archaeological Chemist ( ASI )