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

The correct answer is Option 3: Nagarjunsagar-Srisailam.

Under the Wildlife Protection Act, 1972, Critical Tiger Habitats (CTH), also known as the core areas of tiger reserves, are identified based on scientific evidence to be kept inviolate for tiger conservation. Among the given options, the area distribution is as follows:

• Nagarjunsagar-Srisailam (Andhra Pradesh): It holds the largest CTH in India, spanning approximately 2,595.72 sq. km.
• Sunderbans (West Bengal): Has a CTH of about 1,699.62 sq. km.
• Corbett (Uttarakhand): Its CTH covers around 821.99 sq. km.
• Ranthambore (Rajasthan): Its CTH is approximately 1,113.36 sq. km.

While Nagarjunsagar-Srisailam is the largest tiger reserve in India by total area, it specifically maintains the largest notified Critical Tiger Habitat, making Option 3 the correct choice. This reserve spans across the Nallamala forest range, providing a vast, contiguous landscape for tiger movement and biodiversity.