It is the largest sanctuary in the state and extended in area of 1,504.96 km2 (581.07 sq mi) in plateaued landscape of Kaimur Range.

It also has numerous Megaliths, Rock painting of prehistoric age and stone inscription from a bygone era.

The number increases in the migratory season i.e. during the winters, when there is an influx of birds from the Central Asian region.

[citation needed] Birds such as the lesser white-fronted goose, ferruginous duck, Baer's pochard duck and lesser adjutant, greater adjutant, black-necked stork, and Asian openbill stork migrate from Central Asia to the park during winter.

[citation needed] Fishes are found in Anupam Lake and Kalidah near Rameshwar kund.