Arunachala Hill is a sacred mountain located in Tiruvannamalai, Tamil Nadu, India. It rises to an elevation of about 2,668 feet and is considered a spiritual center in Hinduism. The hill is dedicated to Lord Shiva, who is believed to have manifested here in the form of a column of fire. The area surrounding Arunachala is home to several ancient temples, including the famous Arunachaleswarar Temple. Pilgrims and tourists visit the hill for its spiritual significance and natural beauty. The annual festival of Karthigai Deepam attracts thousands, as a giant flame is lit at the summit to symbolize divine light.