The southern border of the park is roughly defined by the Mora Diphlu river. Further south are the hills of Barail and the Mikir. The National Highway NH-37 was once the formal southern boundary of the park.
Following the Mora Diphlu river, the southern border of the park extends to the Barail hills and the Mikir area. Historically, the National Highway NH-37 defined the southern edge of the park.