The Mangala Devi Kannagi temple is located on the border of Tamil Nadu and Kerala. It is located about 7 km from Pazhiyankudi in Theni district and 15 km from Thekkadi of Idukki District, Kerala. Cheran Chenguttuvan, the king of ancient Tamilakam, had erected the temple for Kannagi around 2000 years back at Vannathiparai and called it Kannagi Kottam or Mangaladevi Kannagi temple and performed regular pujas. Its sits at an altitude of about 1337m above the sea level. It is surrounded by lush greenery and is closed throughout the year except during the Chitra Pournami festival. At other times tourists can still view it by getting a special letter from the forest ranger.