The Palani Hills Wildlife Sanctuary and National Park is a proposed Protected area in Dindigul District, Tamil Nadu State South India. The Park will be an upgrade and expansion of the 736.87 km² (PRO) Palani (Kodaikanal) Wildlife Sanctuary which was to be established in 2008. The park includes about 36% of the 2,068 square kilometres (798 sq mi) in the Palani Hills.
The Palani Hills derive their name from the ancient temple town of Palani located at the northern base of the hills.In 1906, the great undulating plateau on top of the Palanis comprising four Forest ranges were consolidated under the Indian Forest Act of 1878 and designated by the British Government as a single Reserve Forest, from Kodaikanal town to the Kerala state border in the west and the Bodinayakkanur town limits to the south, and given the name of the Ampthill Downs. It was over 53 square miles (140 km2) in extent and about one quarter of it then consisted of sholas and three quarters was open, rolling, grassy downs.
The Palni Hills are an eastward spur of the Western Ghats with a maximum east-west length of 65 kilometres (40 mi), and a north-south width of 40 kilometres (25 mi). Area is 2,064 square kilometres (797 sq mi). These hills rise in steep escarpments to a high undulating plateau ranging from 1,600 metres (5,200 ft) to over 2,000 metres (6,600 ft) elevation.
The western extremity of the Park is contiguous with the Manjampatti Valley core area of the Indira Gandhi Wildlife Sanctuary and National Park and with The Chinnar Wildlife Sanctuary in Kerala. The Kurinjimala Sanctuary in Kerala borders the southwestern corner of the Park.These Wildlife Sanctuaries are adjacent to the recently established Eravikulam National Park.