Painted Hills is one of the three units of the John Day Fossil Beds National Monument, located in Wheeler County, Oregon. It totals 3,132 acres (1,267 ha) and is located 9 miles (14 km) northwest of Mitchell, Oregon. The Painted Hills are listed as one of the Seven Wonders of Oregon. Painted Hills is named after the colorful layers of its hills corresponding to various geological eras, formed when the area was an ancient river floodplain.