Actually, Western Ghats do extend into TN entering through Nilgiris. Theni, Virudunagar,Coimbatore,Erode,Salem,Dindugal,Kanniyakumari,Tenkasi,Tirunelveli,Tiruppur districts have Western Ghat ranges. Infact in IMD and TN Gov Press Releases, they label these districts as "Merku thodarchi malai thodar otti ulla maavatangal" meaning districts bordered by Western Ghats.