The lake is naturally able to sustain resident birds through out the year and migratory birds during winter season. The sanctuary is spread over an area of 693.82 Nature's, The sanctuary is under the administrative control of Sohelwa Wildlife Division whose head quarter is at Balrampur. Parwati and Arga wetland have not known to dry up. At few places the depth of the lake is about 20 Mtr. The biggest attractionof the sanctuary is the presence of varities of avian found. At least 153 Species of avifauna belonging to 33 families have been identified in the Parwati Arga wetland.