Gogabeel Lake in Katihar district, Bihar — a natural oxbow lake formed by the meandering of the Ganga and Mahananda rivers — was listed as Ramsar site no. 2579 with designation date 13 May 2025 and last publication date 30 October 2025. Covering approximately 86.63 hectares, Gogabeel was already Bihar's first Community Reserve, declared in 2019 under the Wildlife (Protection) Act, 1972. The lake supports over 90 bird species, including 30 migratory species, and is a critical habitat for the vulnerable Lesser Adjutant Stork, and Smooth-coated Otter. With this designation, Bihar now has six Ramsar sites, ranking third in India after Tamil Nadu and Uttar Pradesh. India's Ramsar-site total has since risen to 99 after Shekha Jheel Bird Sanctuary was designated in April 2026. The Ramsar Convention on Wetlands was signed in Ramsar, Iran in 1971 and India acceded to it in 1982.