Thalaiyar Falls, also known as Rat Tail Falls is a waterfall Located in the Theni District,which flows as Manjalar River, one of the tributaries of Vaigai river which flows in the south of Tamil Nadu State, South India. It is 975 ft (297 m) tall and is the highest waterfall in Tamil Nadu, the Sixth highest waterfall in India and the 267th highest in the world.