The correct answer is option 1, Bhitarkanika. Bhitarkanika is a national park located in the state of Odisha, India, and it is famous for its population of saltwater crocodiles. These crocodiles are the largest living reptiles and can grow up to 6 meters in length. Bhitarkanika is home to the largest population of saltwater crocodiles in India, and it is considered one of the most important crocodile sanctuaries in the country.

Option 2, Machilipatnam, is a town in Andhra Pradesh, India, and it is not particularly known for saltwater crocodiles.

Option 3, Pulicat Lake, is a saline lagoon located on the border of Andhra Pradesh and Tamil Nadu in India. While it is a habitat for a variety of bird species, it is not specifically known for saltwater crocodiles.

Option 4, Rann of Kutch, is a seasonal salt marsh located in the Thar Desert of Gujarat, India. While it is home to several other species of wildlife, it is not particularly known for saltwater crocodiles.

Alert - correct answer should be option 1.