The correct answer is: b) Southern Tamil Nadu.
Pichavaram is a famous mangrove forest located in the Cauvery delta in the South Indian state of Tamil Nadu. It is the second largest mangrove forest in India after the Sundarbans. The forest covers an area of about 1,000 hectares and is home to a variety of plant and animal life. It is a popular tourist destination and is also an important site for research and conservation.
The other options are incorrect. Option a) is incorrect because Pichavaram is located in Southern Tamil Nadu, not Northern Tamil Nadu. Option c) is incorrect because Pichavaram is a mangrove forest, not a mountain range. Option d) is incorrect because Pichavaram is located in the Cauvery delta, not the Eastern Ghats.