Deep inside the forest of Periyar Tiger Reserve, you will find a 1000 years old ancient temple of Mangaladevi. This is the place, where, Kannaki, a legendary Tamil woman, betrayed all her grudge and transformed herself to be a divine lady (Mangaladevi) showering blessings upon the people on earth.There is a mind boggling legend behind this divine temple of Mangaladevi. Kannagi, the devoted wife of Kovalan, took revenge against killing her innocent husband by accusing him as a thief. It is said that she burnt the whole Madurai city and later she reached the Suruli hills. From here she went to the heaven in Pushpaka Vimana along with Kovalan. Getting inspired from this story, Chera Chenguttuvan, the ancient Tamilakam King, erected this temple of Mangaladevi here. The story of Kannagi was narrated to the Tamil poet, Illango Adigal by Chenguttuvan and later Illango wrote the famous book 'Silappathikaram', the story of Kannagi and Kovalan.The temple is famous for its Pandyan architecture. The boundary walls and the steps leading to the temple are made up of huge stones. The location of the temple on the top of the hill itself proves the effort taken to complete the structure there. Apart from Mangala Devi you can also sight some other idols there. Entering the complex you can see the idol of Karuppuswamy, on the left side there is Lord Shiva and you can also sight a sanctorum for Ganapathy too. You can also find an underground passage from this temple. Numerous stories revolve around this passage. According to the local people, the passage leads to the Madurai town and some says that the passage will take you to the Pandya Kingdom.