Tirunelveli has an area of 87.64 km². It is bounded by Virudhunagar District to the north, Thoothukudi District to the east, the Indian Ocean to the south, Kanyakumari District to the southwest, and Kerala to the west. The chief towns are Courtallam also called as Kuttalam, Sankarankoil, Tenkasi, and Tirunelveli.

It is located on the banks of the perennial Thamirabarani River, 75 km from Kanyakumari, the southernmost tip of India. The Thamirabarani contains traces of copper, hence its name (Thamiram means copper in Tamil). Tirunelveli can be easily reached from Madurai (4 hours) or Nagercoil (1 1/2 hrs).It is one of the Ayyavazhi populated districts of Tamil Nadu.

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