Explanation:

• Bhitarkanika Mangroves is India’s second largest forest, located in Odisha. Bhitarkanika is created by the two river delta of Brahmani and Baitarani rivers and one of the important Ramsar Wetlands in India. Hence, pair 3 is correctly matched. • Pichavaram mangrove is one of the largest mangroves in India, situated at Pichavaram near Chidambaram in Tamil Nadu. Pichavaram ranks among the one of the most exquisite scenic spots in Tamil Nadu and is home of many species of Aquatic birds. Hence, pair 1 is not correctly matched. • Baratang Island Mangroves is a beautiful swamp, located at Great Andaman and Nicobar Islands. Mangrove Swamps of Baratang Island are situated between Middle and South Andamans, the capital city of Port Blair. Hence, pair 2 is not correctly matched. • Ratnagiri Mangroves are located on the west coast of India in the state of Maharashtra. The studies revealed that Ratnagiri district shows biodiversity of mangroves with 20 species with 15 genera. Hence, pair 4 is correctly matched.