What is the Grand Canyon?
The Grand Canyon is a steep, layered canyon carved by the Colorado River.
It exposes rock layers that record nearly two billion years of Earth history.
Location and formation
The canyon lies in northwestern Arizona within Grand Canyon National Park. The Colorado River runs through the canyon and continues shaping its course.
Geologists estimate the main river incision began about 5 to 6 million years ago. Older rocks exposed in the walls date far earlier than that.
History and cultural importance
People have lived in and around the canyon for thousands of years. Tribes with deep ties include the Hopi, Havasupai, Hualapai, and Navajo.
European Americans first documented the canyon in the 16th century. Major John Wesley Powell led a famous river expedition through the canyon in 1869.
The area gained federal protection as a national monument in 1908. It became Grand Canyon National Park in 1919.
Characteristics and ecology
The park covers about 1,217,262 acres and reaches roughly one mile deep in places. Elevation and climate changes create habitats from desert scrub to conifer forest.
Wildlife includes California condors, bighorn sheep, mule deer, and many smaller species. Plant communities shift rapidly with elevation and exposure.
Significant events and conservation
The Grand Canyon was designated a UNESCO World Heritage Site in 1979. Conservation balances tourism, tribal rights, and river management.
Park managers and tribes collaborate on cultural site protection and scientific research. Ongoing efforts address water use, invasive species, and visitor impact.
Recreational uses
Hiking along the rims and into the canyon is a primary activity.
Popular trails include the Bright Angel and South Kaibab routes.
Whitewater rafting on the Colorado River offers multi‑day wilderness trips.
Mule rides, scenic drives, camping, and ranger programs attract many visitors.
Backcountry permits and river permits are required for many activities.
Visitors should plan ahead and follow park safety guidelines.