Andhra Pradesh Border - elaur - Gummidipundi – Kavaraipettai - Chennai 45 km (28 mi) 3 7 From Karnataka Border - Hosur - Krishnagiri - Dharmapuri - Salem - Namakkal - Karur - Dindigul - Madurai - Virudhunagar - Sattur - Kovilpatti - Tirunelveli - Nanguneri - Vattakottai up to Kanniya Kumari 627 km