Rat Tail Falls/ Thalaiyar Falls is located in the lush green slopes of Palani Hill ranges in the Dindigul District, in Kodaikanal. With a height of 297m, it is the highest waterfall in Tamil Nadu, sixth highest waterfall in India and the 267th highest in the world. There is view tower in the park at the Dum Dum Rock, from where you can get a beautiful view of the falls and the Manjalar Dam.The river water coming to the falls is from Perumal Malai village, through a 9 km downstream and is said to be clear. On the contrary, it may be polluted, and hence, visitors to the area are advised to avoid drinking it. The the top of the falls, at the very edge of the cliff, is a low concentrated wall on either side, tapering the flow of water into a rat tail shape. One can walk along the wall and get to the center of the falls.Right below one of the walls, is a large flat rock, about five ft wide. If one gets down to the edge of this stone, they can directly see a little river at the bottom flowing through the forest. On the side, one can enjoy the calm of the silent waterfall.