Which protected area is the largest national park and tiger reserve in Keralam?

The Periyar National Park and Tiger Reserve is the largest national park and tiger reserve in Keralam.1

Located in the south-central part of the state, the reserve encompasses an area of 350 square miles (900 square km). It originated as a reserve forest in 1899 and was later designated as the Nellikkampatty Game Sanctuary in 1934. It was established as a wildlife sanctuary in 1950, became a tiger reserve in 1978, and its core zone was declared a national park in 1982. The area is a critical habitat for diverse wildlife, including elephants and tigers, and is sustained by the Periyar River, which originates within the reserve.234