Historical Boundaries
Tamilakam can be defined as the region with the following boundaries: Eastern boundary: West of Bay of Bengal Western boundary: East of Deccan, i.e., Eastern Ghats till it joins the Western Ghats and then the Western Ghats Nothern boundary: South of Pennar river Southern boundary: North of Kanyakumar and Indian Ocean Tamilakam can be divided into these zones: Northern Tondaimandalam: Pennar to Palar river Southern Tondaimanadalam: Palar to Pennai river Nadu Nadu: Pennai river to Kollidam/Kaveri Kaveri Delta: Region around Kaveri. Also referred to as Cholanadu Pandiya Nadu: Madurai, Vaigai basin and the far southern regions. Kongu Nadu: Inland western region that covers modern Coimbatore Note that classical Tamilakam technically also contains Cheranadu that is to the west of western ghats.