Answer : 2. "Tamil Nadu"
Explanation :

The conclusion of the Chithirai festival was marked by the return procession of Lord Kallazhagar from the Vaigai River. The Alagar Temple, located at the foothills of the Alagar Hills in Madurai, Tamil Nadu, is one of the 108 abodes of Lord Vishnu, known as Kallazhagar. It has six corridors within the fort walls and is mentioned in the Tamil epic Silappadikaram and Alvar hymns.