Parambikulam Tiger Reserve, which also includes the erstwhile Parambikulam Wildlife Sanctuary, is a 643.66 square kilometres (248.5 sq mi) protected area lying in Palakkad district and Thrissur district of Kerala state, South India. The Wildlife Sanctuary, which had an area of 285 square kilometres (110 sq mi) was established in part in 1973 and 1984. It is in the Sungam range of hills between the Anaimalai Hills and Nelliampathy Hills. Parambikulam Wildlife Sanctuary was declared as part of the Parambikulam Tiger Reserve on 19 February 2010. Including the buffer zone, the tiger reserve has a span of 643.66 kmÂ². The Western Ghats, Anamalai Sub-Cluster, including all of Parambikulam Wildlife Sanctuary, has been declared by the UNESCO World Heritage Committee as a World Heritage Site. The Tiger Reserve is the home of four different tribes of indigenous peoples including the Kadar, Malasar, Muduvar and Mala Malasar settled in six colonies. Parambikulam Tiger Reserve implements the Project Tiger scheme along with various other programs of the Government of India and the Government of Kerala. The operational aspects of administering a tiger reserve is as per the scheme laid down by the National Tiger Conservation Authority. People from tribal colonies inside the reserve are engaged as guides for treks and safaris, and are provided employment through various eco-tourism initiatives. Parambikulam Tiger Reserve is among the top-ten best managed Tiger Reserve in India. The tiger reserve hosts many capacity building training programmes conducted by Parambikulam Tiger Conservation Foundation in association with various organisations.