At a distance of 40 Kms from Kodaikanal & 485 Kms from Chennai, Thalaiyar Falls, also known as the Rat Tail Falls is the highest waterfalls in Tamil Nadu and third highest falls in India. It is also one of the popular sites for trekking near Kodaikanal.
With a height of 975 feet (297 meters), the falls is visible from a great distance on the ghat road towards Dindigul. This falls is considered inaccessible to the general public, as there is no access road to it. However, one can reach these falls with 6 kms trekking after 34 Kms of road journey on ghat road from kodaikanal. The trek duration is around 2-3 hours one way. The trek is considered to be of moderate difficulty.
The very edge at the top of the falls has a concrete wall. One can walk along the wall and get near the center of the falls. The water here is considered polluted and it's better to avoid bathing here.
One can catch Dindigal / Madurai buses from Kodaikanal, get down at the ghat road after 34 Kms and trek down to the falls from here. There are no sign boards but can get done at the mile stone which shows distance to Kodai as 34 km.