The Painted Desert is a vast badlands desert in northern Arizona, extending from near Grand Canyon National Park through Petrified Forest National Park and beyond Holbrook. Known for its vivid bands of red, lavender, and other muted colors, it is shaped from the Triassic Chinle Formation, whose mineral-rich rocks erode into ridges, gullies, and painted slopes. This geology is tied to the region’s famous petrified wood, preserved when silica from volcanic ash fossilized an ancient conifer forest. Erosion continues to reveal fossils, dinosaur tracks, and signs of early human habitation. Named by Coronado’s expedition in 1540, the desert remains one of Arizona’s most distinctive protected landscapes.