Book Cliffs

The Book Cliffs are a series of desert mountains and cliffs in western Colorado and eastern Utah in the Western United States. They are so named because the sandstone layers that make up the Cretaceous-aged cliffs capping many of the south-facing buttes appear similar to a shelf of books. The escarpment of the Book Cliffs is approximately 250 miles (400 km) long, and is the longest continuous escarpment in the world, stretching from to Grand Junction, Colorado.