Gogabeel Lake in Katihar district, Bihar, is listed by Ramsar as Site no. 2579, with designation date May 13, 2025 and RIS last publication date October 30, 2025. It is a natural oxbow lake formed by the meandering of the Ganga and Mahananda rivers, with the official Ramsar site area listed as 86.6 hectares.

Bihar now has 6 Ramsar sites, standing 3rd after Tamil Nadu and Uttar Pradesh. Gogabeel was declared Bihar's first Community Reserve in 2019 under the Wildlife (Protection) Act, 1972. During monsoon, the lake connects with the Ganga and Mahananda rivers, supporting migratory birds and aquatic biodiversity. Rajasthan has 2 Ramsar sites — Sambhar Lake and Keoladeo Ghana National Park.