Parambikulam Tiger Reserve, which also includes the erstwhile Parambikulam Wildlife Sanctuary, is a 643.66 square kilometres (248.5 mi2) 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 mi2) 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 km2. 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.