The area of the Park is 891 hectares and it is situated approximately 20 kilometres north-east of Stanthorpe, 50 kilometres west of Urbenville and 60 kilometres north of Tenterfield in far northern New South Wales. Maryland National Park is surrounded entirely by private property, much of which retains a natural vegetation cover.
The Park is close to a number of other protected areas, including Bald Rock, Boonoo Boonoo, Koreelah, and Tooloom National Parks, Captains Creek Nature Reserve, Girraween and Sundown National Parks (both in Qld). Except for Maryland National Park and Captains Creek Nature Reserve, all the parks provide recreation facilities.
The Park is at the northern extremity of the New England Tableland’s granite belt that covers an area of 2,500 square kilometres, extending from Tamworth to southern Queensland. The granite belt was created by a large intrusion of molten rock more than 225 million years ago into the older sedimentary and volcanic rocks. This huge granitic formation is known as the New England Batholith.