Cecil Andrus was Governor of the State of Idaho and later became Secretary of the Interior. I met him last year. Frank Church was a senator from Idaho, and Idaho's largest wilderness area is named after him. This is the largest roadless area in the lower 48 states. My great grandfather was an Idaho State senator and was also postmaster for the state, many years ago.
Largest in the USA is Gates of the Arctic in Alaska. Largest in the lower 48 is Frank Church River of No Return in Idaho and NOT "Death Valley Wilderness in California" as falsely reported elsewhere in Wikipedia.
Another name for a remote bush area could be wilderness or backcountry.
The area of Siffleur Wilderness Area is 412.14 square kilometers.
The area of Pepperbox Wilderness Area is 91.297 square kilometers.
The total area of Idaho County Idaho is, 8,485 sq mi, (21,976 km sq)
The area of Galiuro Wilderness is 308.844 square kilometers.
The area of Sylvania Wilderness is 74.167 square kilometers.
The area of Scapegoat Wilderness is 970.987 square kilometers.
The area of Becharof Wilderness is 2,023.428 square kilometers.
The area of Rawah Wilderness is 309.156 square kilometers.
The area of Glastenbury Wilderness is 90.65 square kilometers.