Why devotees come here
Mangala Devi Kannagi Temple stands at about 1,337 metres above sea level in the Periyar forest, on the border between Tamil Nadu and Kerala. It is dedicated to Kannagi, and it opens to devotees only once a year.
Kannagi, the heroine of the Tamil epic Silappathikaram, is the presiding deity here. Legend says she came to this spot after burning the Pandya capital of Madurai, and that she stayed here for 14 days. Devotees also worship her as Mangaladevi.
Tradition says the Chera king Chenguttuvan built a temple for Kannagi about 2000 years ago at Vannathiparai. The temple is generally believed to have been consecrated around the 1st or 2nd century CE.
The main structure is built of large granite pieces and is about 1000 years old, in the Pandyan style. Four stone structures inside the complex hold idols of Karuppa Swamy, Shiva and Ganapathy. On Chitra Pournami, the deity is decked with flowers and silk, and devotees offer pongala, a sweet rice dish.

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