The Great Dividing Range is the boundary to the south-east. It includes the towns of Dungowan, Ogunbil, Woolomin, Loomberah, Piallamore and Nundle.
The Great Dividing Range forms the southeastern border. The mentioned towns—Dungowan, Ogunbil, Woolomin, Loomberah, Piallamore, and Nundle—are within its vicinity.