Among the following Tiger Reserves, which one has the largest area und

Among the following Tiger Reserves, which one has the largest area under “Critical Tiger Habitat”?

Corbett
Ranthambore
Nagarjunsagar-Srisailam
Sunderbans
This question was previously asked in
UPSC IAS – 2020
Among the given options, Nagarjunsagar-Srisailam Tiger Reserve has the largest area designated as “Critical Tiger Habitat”.
Critical Tiger Habitat (CTH), also known as the core area of a tiger reserve, is defined under the Wild Life (Protection) Act, 1972, as amended in 2006. It is an area of adequate size, duly notified by the state government, required to be kept inviolate for the purpose of tiger conservation. The total area and CTH area vary between tiger reserves. As of recent data (around the time this question was likely framed or based on common knowledge about large reserves), Nagarjunsagar-Srisailam consistently ranks as having one of the largest, if not the largest, CTH among major tiger reserves in India.
The approximate CTH areas for the given options are:
Corbett Tiger Reserve: ~821 sq km
Ranthambore Tiger Reserve: ~1113 sq km
Nagarjunsagar-Srisailam Tiger Reserve: ~2595 sq km
Sunderbans Tiger Reserve (Indian part): ~2125 sq km
Based on these figures, Nagarjunsagar-Srisailam has the largest Critical Tiger Habitat area.