The Painted Hills are a striking geological formation located in Oregon, part of the John Day Fossil Beds National Monument. Known for their vibrant colors, the hills display shades of red, yellow, and black, which are the result of volcanic ash and sedimentary deposits. These colors change throughout the day, especially during sunrise and sunset, creating a stunning visual experience. The area is also significant for its rich fossil deposits, which provide insights into the region's prehistoric ecosystems. Visitors can explore various trails that offer views of the hills and learn about the area's natural history through informative signage.