Chinnar Wildlife Sanctuary is located 18 km north of Marayoor on State Highway 17 in the Marayoor and Kanthalloor panchayats of Devikulam taluk in the Idukki district of Kerala state in South India. It is one of 18 wildlife sanctuaries among the protected areas of Kerala.

It has earned the name for being the only rehabilitation centre for the Indian star tortoise in India.It is under the jurisdiction of and contiguous with Eravikulam National Park to the south. Indira Gandhi Wildlife Sanctuary is to the north and Kodaikanal Wildlife Sanctuary is to the east. It forms an integral part of the 1,187 km2 (458 sq mi) block of protected forests straddling the Kerala-Tamil Nadu border in the Anaimalai Hills. The Western Ghats, Anamalai Sub-Cluster, including all of Chinnar Wildlife Sanctuary, is under consideration by the UNESCO World Heritage Committee for selection as a World Heritage Site.

The Chinnar and Pambar rivers are the major perennial water resources in the sanctuary. The Chinnar originates near Kumarikal Malai, follows the interstate boundary along the northwest edge of the sanctuary for 18 km and becomes the Amaravati River in Tamil Nadu.

The Pambar River originates in the Anaimudi Hills and is joined by seasonal rivulets and a few perennial streams originating from sholas in the upper reaches. It traverses the Turner’s Valley in Eravikulam National Park and flows down into the sanctuary through the
Taliar Valley between Kanthalloor and Marayoor villages and eastwards through the sanctuary. It joins the Chinnar River at Koottar. The Thoovanam water falls lie deep within the sanctuary on the Pambar River. This cascade is a major tourist attraction. The Chinnar, Pambar, Kabani and Bhavani are the only rivers of the 44 in Kerala that flow eastwards.