From the record
“Desolation Canyon is a remote canyon on the Green River in eastern Utah, United States that is listed on the National Register of Historic Places (NRHP). It is said to be one of the most remote areas in the contiguous United States.”
Wikipedia article Desolation Canyon, CC BY-SA 4.0.
One of 26 National Register listings published here for Carbon County · listed in 1968 · category: Site · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service