Tamilnadu had a unique civilization unique in the sense, it was the most most chaotically recorded civlisationin the history of whole India. For a very long time the tiny tail like part of the Indian subcontinent was about of bounds for most of the invaders beyond the Vindhya -Sathpura hill ranges. This hill range cuts the Indian subcontinent into two Uththarapada ( Northern part )and Dakshinapada ( southern part) except for a linear vertical strip of land in the west and east along the coastline.
These coast lines are called as eastern coast and western coast. But they have other names too which are more poetic and descriptive of the geopolitical history of the land . The West coast is better known as Arabian seacoastand .. the easrtern coast is called as the coromandel coast named in the glory of the Chola dynasty. The only one dynasty in the entire world which ruled the Tamilagam and its neighboring states continuously for almost thousand years . From the 9TH century onwards..
Western coast or the Arabian coast t is historically more connected with the western countries and had a flourishing trade with all countries be it Mediterranean countries or European countries like Rome and Greek. And another equally important fact is that most of the European countries that landed on India did so on the western coast either for the purpose of trade or invading India or more holy purpose of spreading the religion to the barbaric Indians who worshipped trees, cattle , monkeys and elephants

. Whatever be the reason western coast is the point of entry. Not only for the civilized Europeans but even the primitive man followed the coastal route when he began his OUT OF AFRICA journey which is first ever journey of the mankind seeking food and shelter. Till date the African origin of man has not been challenged by any reasonable scientific manner. Nor their journey from the Africa is the way the mankind spread to other parts of the world. Immediately after the Homosapiens appeared they stared their adventurous journey ,
. Why did they start moving is not known. For food and shelter seems a reasonable answer. At the same time there could not have been a scarcity for the same immediately after the arrival of the mankind in this world . More out of curiosity than necessity the African born men divided in to two groups. One group started moving west to reach and settle in what was to be Europe and Americas later,. Another group started moving towards the East and they preferred to go along the coast wherever it is possible and even took the sea route with the help of wooden logs and rafters . They seemed to be in a hurry. In a race like pace they travelled and stopped not till they reached Australia. Once they reached Australia something told them ,it seems , so far and no more,” .They settled there itself . we can assume so because there is no evidence that the OOA migrants turned back to their original place. Too much of trouble , they seemed to think