Answer : 1. "तमिलनाडु"
Explanation :

The Tamil Nadu government is planning to build a high-level bridge to protect the Pallikaranai Marshland, a freshwater and saltwater wetland located 20 km south of Chennai. As one of Chennai's last natural wetlands, it acts as an aquatic buffer, draining 250 sq km into the Bay of Bengal through the Okkayam Madavu and Kovalam creeks. As a Ramsar site, it supports a diverse range of species, including 115 bird species, Russell's viper and glossy ibis.