Nagi Bird Sanctuary is located in Jhajha Jamui district of south Bihar, near the Jharkhand border. It was declared a bird sanctuary on 25 February 1984 as per Section 18 of the Wildlife (Protection) Act, 1972. The final notification under Section 26A of the act was issued on 4 September 2009. Thousands of migrating birds congregate in the reservoir during the winter season, especially from November to February. The area of the sanctuary is 2.1 square kilometres. It is home to over 133 bird species. There are also a variety of dragonflies, damselflies and butterflies which are yet to be studied and documented. In 2004, Nagi Dam Bird Sanctuary was declared an Important Bird Area (IBA) by BirdLife International. The area overlapping with the IBA is 791 ha.