Sathyamangalam Wildlife Sanctuary and Tiger Reserve is a protected area and tiger reserve along the Western Ghats in the Indian state of Tamil Nadu. First declared as a wildlife sanctuary in 2008 and enlarged in 2011, it covers a forest area of 1411.6km2 and is the largest wildlife sanctuary in Tamil Nadu. In 2013, it became the fourth tiger reserve as a part of Project Tiger in the state of Tamil Nadu.Sathyamangalam forest range is a significant wildlife corridor in the Nilgiri Biosphere Reserve between the Western Ghats and the rest of the Eastern Ghats and a genetic link between the four other protected areas which it adjoins, including the Billigiriranga Swamy Temple Wildlife Sanctuary, Sigur Plateau, Mudumalai National Park and Bandipur National Park. The sanctuary covers parts of Sathyamangalam taluk and Gobichettipalayam taluk of Erode District in north western Tamil Nadu.