Code of Federal Regulations Title 43. Public Lands:  Interior § 43.3400.2 Lands subject to leasing

(1) The National Park System;

(2) The National Wildlife Refuge System;

(3) The National Wilderness Preservation System;

(4) The National System of Trails;

(5) The National Wild and Scenic Rivers System, including study rivers designated under section 5(a) of the Wild and Scenic Rivers Act;

(6) Incorporated cities, towns, and villages;

(7) The Naval Petroleum Reserves, the National Petroleum Reserve in Alaska, and oil shale reserves;  and

(8) National Recreation Areas designated by law;