Carved out by the Colorado River, the Grand Canyon (nearly 1,500 m deep) is the most spectacular gorge in the world. Located in the state of Arizona, it cuts across the Grand Canyon National Park. Its horizontal strata retrace the geological history of the past 2 billion years. There are also prehistoric traces of human adaptation to a particularly harsh environment.

Grand Canyon National Park, in Northern Arizona, encompasses 278 miles (447 km) of the Colorado River and adjacent uplands. Located on ancestral homeland of 11 Associated Tribes, Grand Canyon is one of the most spectacular examples of erosion anywhere in the world—unmatched in the incomparable vistas it offers visitors from the rims.