Nine Mile Canyon is a canyon, approximately 40 miles (60 km) long, located in the counties of Carbon and Duchesne in eastern Utah, in the Western United States. Promoted as "the world’s longest art gallery", the canyon is known for its extensive rock art, most of it created by the Fremont culture and the Ute people. The rock art, shelters, and granaries left behind by the Fremont make Nine Mile Canyon a destination for archaeologists and tourists alike.