The Holy Mountain of Arunachalam rises up with an elevation of 2669 feet (800 m). The Road encircling the mountain where devotees circumbulate is 8 1/2 miles which is 14 kms long. On Full Moon(Pournami) days and festival days (like Karthigai, first day of the Tamil month, Tamil New Year day) hundreds and thousands of devotees circumbulate (GIRIVALAM) the mountain and get the blessings of the Lord Arunachalam. The Annamalai Hill was Agni (fire) during Kirthayugam, was Manikkam (Emerald) during Threthayugam, was Pon (Gold) during Dwaparayugam and rock during Kaliyugam. There are eight lingams located at the eight directions and provides an octagonal structure to Tiruvannamalai Town. The eight lingams are: Indra Lingam, Agni Lingam, Ema Lingam, Niruthi Lingam, Varuna Lingam, Vayu Lingam, Kubera Lingam and Esanya Lingam.