1938 poster of the park
A map of the Colorado Plateau.
Grand Canyon Quarter
The Four Corners region and the Colorado Plateau. Click image to see state lines.
Panorama of Glen Canyon Dam showing Lake Powell, Glen Canyon Dam and Carl Hayden Visitor Center.
Grand Canyon regional map
The Book Cliffs of Utah.
La conquista del Colorado, by Augusto Ferrer-Dalmau, depicts Francisco Vázquez de Coronado's 1540–1542 expedition
A boater on the river in Glen Canyon before damming, circa 1898.
From Powell Point on the South Rim
The Green River runs north to south from Wyoming, briefly through Colorado, and converges with the Colorado River in southeastern Utah.
Mexico in 1824. Alta California is the northwesternmost state.
Map showing locations of major dams in the Colorado River Basin, with Glen Canyon near the center of the basin.
Sunset at Cape Royal Point, North Rim. Wotans Throne featured.
MODIS satellite image of Grand Canyon, Lake Powell (black, left of center) and the Colorado Plateau. White areas are snow-capped.
Geronimo (far right) and his Apache warriors fought against both Mexican and American settlers.
Echo Park, looking south with the Yampa River (left) joining the Green River. The USBR proposed damming the Green a short distance downstream, behind the large cliff (Steamboat Rock) at right.
From Toroweap Overlook on the North Rim
The Permian through Jurassic stratigraphy of the Colorado Plateau area of southeastern Utah that makes up much of the famous prominent rock formations in protected areas such as Capitol Reef National Park and Canyonlands National Park. From top to bottom: rounded tan domes of the Navajo Sandstone; layered red Kayenta Formation; cliff-forming, vertically jointed, red Wingate Sandstone; slope-forming, purplish Chinle Formation; layered, lighter-red Moenkopi Formation; and white, layered Cutler Formation sandstone from the Glen Canyon National Recreation Area in Utah.
Children of Depression-era migrant workers, Pinal County, 1937
Near Music Temple in Glen Canyon during the 1870s
From Desert View on the South Rim
Castle Gate rock formation in Carbon County, UT.
Eleanor Roosevelt at the Gila River relocation center, April 23, 1943
Glen Canyon damsite from the air in November 1957, prior to construction of the Glen Canyon Bridge
Navajo sandstone cliffs in Zion National Park.
Köppen climate types of Arizona
Architectural plans for the Glen Canyon Dam and ancillary structures
Sunset in Ojito Wilderness, near Albuquerque, NM
The Grand Canyon
Glen Canyon Dam under construction, 1962
Castle Gate Power Plant near Helper, UT.
View of suburban development in Scottsdale, 2006
Lake Powell filling underway, 1965
A population density map of Arizona
Glen Canyon Dam releasing floodwater in 1984, testing repairs of the spillways which were heavily damaged in 1983.
Extent of the Spanish language in the state of Arizona
The right spillway gates during 1983 flood, showing flashboards that were installed to increase the water level
A Navajo man on horseback in Monument Valley
Low water levels on Lake Powell in April 2006, seen from Hole in the Rock. The water is 107 ft below the top of the "bathtub ring" along the reservoir shore.
The Spanish mission of San Xavier del Bac, founded in 1700
An aerial view of Glen Canyon Dam from upstream, showing the spillways to lower left and right, the Glen Canyon Bridge and the electric switchyard to the right of the bridge.
Arizona's Meteor Crater is a tourist attraction.
Glen Canyon Dam and Lake Powell
Entering Arizona on I-10 from New Mexico
Francis turbine runner on display
The original Arizona State Capitol in Phoenix
A generator being repaired with rotor removed
Art Deco doors of the Cochise County Courthouse in Bisbee
View of the power plant and grass lawn
Arizona teacher's strike and rally on April 26, 2018
Inside the turbine hall at the Glen Canyon Power Plant
The University of Arizona (the Mall) in Tucson
View of the Colorado immediately downstream of Glen Canyon Dam (right). The green, clear water is caused by the dam trapping sediment, which would naturally cause the river to have a reddish-brown color.
Arizona State University (a biodesign building) in Tempe
The Colorado River is now much calmer and colder than before the dam was built.
Northern Arizona University (The Skydome) in Flagstaff
River outlet works are open during high flow experiment in December 2012.
View of Monument Valley from John Ford's Point
Map of Lake Powell and the Glen Canyon NRA
Standin' on the Corner Park and mural in Winslow, Arizona
State Farm Stadium in Glendale
A spring training game between the Cubs and White Sox at HoHoKam Park

Grand Canyon National Park, located in northwestern Arizona, is the 15th site in the United States to have been named as a national park.

- Grand Canyon National Park

Glen Canyon Dam is a concrete arch-gravity dam on the Colorado River in northern Arizona, United States, near the town of Page.

- Glen Canyon Dam

This province covers an area of 336,700 km2 (130,000 mi2) within western Colorado, northwestern New Mexico, southern and eastern Utah, northern Arizona, and a tiny fraction in the extreme southeast of Nevada.

- Colorado Plateau

Northern Arizona features forests of pine, Douglas fir, and spruce trees; the Colorado Plateau; mountain ranges (such as the San Francisco Mountains); as well as large, deep canyons, with much more moderate summer temperatures and significant winter snowfalls.

- Arizona

Among its eight national parks are Grand Canyon, Zion, Bryce Canyon, Capitol Reef, Canyonlands, Arches, Mesa Verde, and Petrified Forest.

- Colorado Plateau

In addition to the internationally known Grand Canyon National Park, which is one of the world's seven natural wonders, there are several national forests, national parks, and national monuments.

- Arizona

(Later, the Glen Canyon Dam would be built upriver.) A second Grand Canyon National Monument to the west was proclaimed in 1932.

- Grand Canyon National Park

These two dams would be partially inside Grand Canyon National Park.

- Glen Canyon Dam

Construction of the Hoover Dam in the 1930s and the Glen Canyon Dam in the 1960s changed the character of the Colorado River.

- Colorado Plateau

The canyon itself was created by the incision of the Colorado River and its tributaries after the Colorado Plateau was uplifted, causing the Colorado River system to develop along its present path.

- Grand Canyon National Park

Because the dam site lay in a remote, rugged area of the Colorado Plateau – more than 30 mi from the closest paved road, U.S. Route 89 – a new road had to be constructed, branching off from US 89 north of Flagstaff, Arizona, and running through the dam site to its terminus at Kanab, Utah.

- Glen Canyon Dam

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Colorado River

One of the principal rivers (along with the Rio Grande) in the Southwestern United States and northern Mexico.

Headwaters of the Colorado River in Rocky Mountain National Park, Colorado
Colorado River in the Grand Canyon seen from Pima Point, near Hermit's Rest
Satellite view of the Colorado River valley near Yuma, Arizona; interstate 8 runs from left to right just below center.
Colorado River as it exits the United States into Mexico beneath the San Luis Colorado-Colonia Miguel Aléman Bridge (September 2009)
The San Juan River near Mexican Hat, Utah
The Green River at Mineral Bottom, just north of Canyonlands National Park
Annual Colorado River discharge volumes at Lee's Ferry between 1895 and 2004
Map showing the Upper and Lower Colorado River Basin, and adjacent areas supplied by Colorado River water.
The Black Suspension Bridge crosses the Colorado River in the Grand Canyon at Phantom Ranch, Arizona.
Remnants of basalt flows from the Uinkaret volcanic field are seen here descending into the Grand Canyon, where they dammed the Colorado over 10 times in the past 2 million years.
Navajo woman and child, photographed by Ansel Adams, c. 1944
Pueblos and cliff dwellings such as this one in New Mexico were inhabited by people of the Colorado River basin between 2,000 and 700 years ago.
Two Mohave warriors beside the Colorado River in 1871
La conquista del Colorado, by Augusto Ferrer-Dalmau, depicts Francisco Vázquez de Coronado's 1540–1542 expedition
Coronado Sets Out to the North, by Frederic Remington, c. 1905
Lithograph of Fort Yuma, c. 1875
Marble Canyon, one of the many gorges that Powell's expedition traversed
The steamboat Mohave No. 2 at Yuma, c. 1876
John D. Lee, date and photographer unknown. He established a permanent ferry across the Colorado.
Harrison Gray Otis, president of the Colorado River Land Company
Hoover Dam releasing water in 1998
The Grand Ditch, one of the earliest water diversions of the Colorado River, is still in use today.
Hoover Dam under construction, 1934
The Imperial Dam (bottom right) diverts water into the All-American Canal (center) running towards Imperial Valley.
Glen Canyon Dam, the largest dam of the Colorado River Storage Project
The main canal of the Central Arizona Project, crossing the Sonoran Desert
Lake Mead in 2010, showing the "bathtub ring" left behind by low water levels
Heavily forested banks of the Colorado River near Topock, Arizona
The Colorado was named for the reddish color caused by its natural sediment loads, but damming the river has caused it to acquire a clear green hue as seen here in lower Glen Canyon.
A rafting party on the Colorado River

Starting in the central Rocky Mountains of Colorado, it flows generally southwest across the Colorado Plateau and through the Grand Canyon before reaching Lake Mead on the Arizona–Nevada border, where it turns south toward the international border.

During the construction of Glen Canyon Dam, environmental organizations vowed to block any further development of the river, and a number of later dam and aqueduct proposals were defeated by citizen opposition.

The 277 mi of the river that flow through the Grand Canyon are largely encompassed by Grand Canyon National Park and are known for their difficult whitewater, separated by pools that reach up to 110 ft in depth.

Grand Canyon

Image of the Grand Canyon and surrounding area taken from the International Space Station
The Grand Canyon from an airplane, with the Colorado River visible
Grand Canyon, Arizona, Nevada, Lake Powell to Lake Mead, June 27, 2017, Sentinel-2 true-color satellite image. Scale 1:450,000.
Diagram showing the placement, age and thickness of the rock units exposed in the Grand Canyon
Rockfalls in recent times, along with other mass wasting, have further widened the canyon
Ancestral Puebloan granaries at Nankoweap Creek
La conquista del Colorado (2017), by Augusto Ferrer-Dalmau, depicts Spanish Captain García López de Cárdenas 1540 expedition
William Bell's photograph of the Grand Canyon, taken in 1872 as part of the Wheeler expedition
Noon rest in Marble Canyon, second Powell Expedition, 1872
Desert View Watchtower in 2004
1923-built steam locomotive No. 4960 at the Grand Canyon Depot
Grand Canyon covered with snow
Smoke from prescribed fires on the South Rim, as seen from Yavapai Point, April 2007.
Natural fog sometimes fills the canyon, during temperature inversions
Grand Canyon Climate Summary Chart (NPS)
A bighorn ram perched on a cliff in the Grand Canyon
A bighorn ewe at the Grand Canyon, 2008
A California condor in flight, photographed from Navajo Bridge at Marble Canyon, 2008. Wild condors are numbered to aid wildlife researchers. As of April 2009, there were 172 wild California condors known.
Red-tailed Hawk flying at the south rim of Grand Canyon
An elk searching for water at Grand Canyon National Park in 2018.
Rafters in the Grand Canyon pass one of the rapids of the (mud-)"colored" Colorado River
Guano Point – a popular vantage point for tourists, situated on the West Rim of the Grand Canyon, Hualapai Indian Reservation
Grand Canyon rescue helicopter, 1978

The Grand Canyon (,, Bidááʼ Haʼaztʼiʼ Tsékooh, Southern Paiute language: Paxa’uipi, Gran Cañón or Gran Cañón del Colorado ) is a steep-sided canyon carved by the Colorado River in Arizona, United States.

The canyon and adjacent rim are contained within Grand Canyon National Park, the Kaibab National Forest, Grand Canyon–Parashant National Monument, the Hualapai Indian Reservation, the Havasupai Indian Reservation and the Navajo Nation.

Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted.

The canyon's ecosystem was permanently changed after the construction of the Glen Canyon Dam in 1963.

Flagstaff, Arizona

Flagstaff's eponymous flagstaff
The Bank Hotel, also known as the McMillan building, in 2012
Benches commemorating Flagstaff's traditional labor forces in Heritage Square
Local rock strata monument in Heritage Square of downtown Flagstaff
Köppen map of Arizona (Oregon State University, 2016)
1929 Baldwin Locomotive No. 12
Flagstaff's visitors center at the railroad depot
Weatherford Hotel with its pine cone and a countdown in December 2010
Northern Arizona University's Walkup Skydome and central campus
Flagstaff City Hall
100px
The north campus area of NAU, showing the Science and Health buildings (center) and the Liberal Arts building (bottom right)
Roadsigns in downtown Flagstaff
Flagstaff airport

Flagstaff is a city in, and the county seat of, Coconino County in northern Arizona, in the southwestern United States.

Flagstaff lies near the southwestern edge of the Colorado Plateau and within the San Francisco volcanic field, along the western side of the largest contiguous ponderosa pine forest in the continental United States.

Flagstaff has a strong tourism sector, due to its proximity to Grand Canyon National Park, Oak Creek Canyon, the Arizona Snowbowl, Meteor Crater, and Historic Route 66.

Southwestern United States

Panoramic view of the southwestern United States
The Chihuahuan desert terrain mainly consists of basins broken by numerous small mountain ranges.
Saguaro cactus in the Sonoran Desert.
The Delicate Arch at Arches National Park
Four Corners Monument
Ancestral Puebloans ruins at Chaco Canyon
Map of Paleo-Indians in the American Southwest and Mexico
Oraibi pueblo
Narváez expedition (1528–36)
1846 map: Mexican Alta California (Upper California) in pink.
United States 1849–1850
United States 1850–1853
1860 Colorado Territory map
Utah Territory evolution 1850–1868
Confederate Arizona (outlined in blue)
Split of Arizona and New Mexico territories, in 1866, after small portion ceded to Nevada
The second transcontinental railroad: the "Santa Fe Route" – 1891.
Sandia Peak Ski Area, New Mexico
Map of the Southwestern United States as defined by the Learning Center of the American Southwest
The Wigwam. A dwelling used by various Native American tribes among the Southwestern US.
Fanciful drawing by Marguerite Martyn in the St. Louis Post-Dispatch of October 21, 1906, headed "Passing of the Country Store in the Southwest"
A Joshua tree (Yucca brevifolia)
The High Plains in Eastern New Mexico, but also located in Eastern Colorado and West Texas
Desert bighorn sheep
Sonoran Desert terrain near Tucson
Chihuahuan Desert terrain near Carlsbad
Monument Canyon, some of the high desert lands found in Colorado
Grand Canyon from the South Rim
White Sands National Park, New Mexico
Little Finland in Gold Butte National Monument, Nevada
Runningback Josh Jacobs of the Las Vegas Raiders NFL team
T. J. McFarland pitcher for the Arizona Diamondbacks professional baseball team.
1. Phoenix (also the largest MSA)
2. El Paso (5th largest MSA)
3. Las Vegas (2nd largest MSA)
4. Albuquerque (also the 4th largest MSA)
5. Tucson (3rd largest MSA)

The Southwestern United States, also known as the American Southwest or simply the Southwest, is a geographic and cultural region of the United States that generally includes Arizona, New Mexico, and adjacent portions of California, Colorado, Nevada, Oklahoma, Texas, and Utah.

The geography of the region is mainly made up of four features: the Mojave, Sonoran, and Chihuahuan Deserts, and the Colorado Plateau; although there are other geographical features as well, such as a portion of the Great Basin Desert.

The southwestern United States contains many well-known national parks including Grand Canyon in Arizona, Death Valley in California, Great Sand Dunes in Colorado, Arches in Utah, Big Bend in Texas, Great Basin in Nevada, and White Sands in New Mexico.

San Juan River (Colorado River tributary)

Alpine scenery at West Fork of the San Juan River, at Wolf Creek Pass, Colorado
San Juan River at Pagosa Springs, Colorado, with hot-air balloons
San Juan River entrenched meanders in the Monument Upwarp, Goosenecks State Park, Utah
Desert terrain around the confluence of the San Juan (above) and Mancos River (below), near the Four Corners
A drawing of the San Juan River, c. 1876
Crews clean up an oil spill on the San Juan River, 1972
Navajo Lake is the largest impoundment of water on the upper San Juan River.
Boaters on the San Juan River at Mexican Hat, Utah

The San Juan River is a major tributary of the Colorado River in the Southwestern United States, providing the chief drainage for the Four Corners region of Colorado, New Mexico, Utah, and Arizona.

The river drains a high, arid region of the Colorado Plateau.

The lower 70 mi of the San Juan River, in a remote portion of the Glen Canyon National Recreation Area, are flooded by Lake Powell, which is formed by Glen Canyon Dam on the Colorado River.

Lake Powell

Glen Canyon Dam in Page, Arizona
Lake Powell Dam and bridge
Lake Powell in 2007
Lake Powell and Grand Staircase-Escalante from space, 2016
Chart showing daily water volume observations for Lake Powell, from Jun 28, 1963 to October 11, 2021
Lake Powell surface area shrinkage
The southwestern portion of Lake Powell in Arizona
Aerial view of Tower Butte (Arizona)
Rainbow Bridge
Area features, click to enlarge
The section of Lake Powell near Dangling Rope Marina, looking southwest at sunrise
Recreational boating and waterskiing spot in Lake Powell, near Page, Arizona. (Castle Rock far right)
Lake Powell photo-mosaic from ISS, 2016

Lake Powell is an artificial reservoir on the Colorado River in Utah and Arizona, United States.

Lake Powell was created by the flooding of Glen Canyon by the Glen Canyon Dam, which also led to the 1972 creation of Glen Canyon National Recreation Area, a popular summer destination of public land managed by the National Park Service.

The Colorado Plateau, through which the canyon cuts, arose some 11 million years ago.

Colorado

State in the Mountain West subregion of the Western United States.

Ruins of Cliff Palace at Mesa Verde National Park. Photo by Gustaf Nordenskiöld, 1891
Great Kiva at Chimney Rock in the San Juan Mountains of Southwestern Colorado. It is said to have been built by the Ancient Pueblo peoples.
The Spanish discovering the Colorado River, namesake of the state, in 1540, by Augusto Ferrer-Dalmau. García López de Cárdenas can be seen overlooking the Grand Canyon.
Map of the Mexican Cession, with the white representing the territory the United States received from Mexico (plus land ceded to the Republic of Texas) after the Mexican–American War. Well over half of Colorado was received during this treaty.
The Anasazi Heritage Center in Dolores
The territories of New Mexico, Utah, Kansas, and Nebraska before the creation of the Territory of Colorado
Mount of the Holy Cross, photographed by William Henry Jackson in 1874
The Georgetown Loop of the Colorado Central Railroad as photographed by William Henry Jackson in 1899
Three 10th Mountain Division skitroopers above Camp Hale in February 1944.
The arid high plains in Southeastern Colorado
Front Range Peaks west of Denver
Tenmile Range and Dillon Reservoir near Breckenridge
Grays Peak at 4352 m is the highest point on the Continental Divide in North America
The high desert lands that make up the San Luis Valley in Southern Colorado
Maroon Bells, at 14163 ft, is part of White River National Forest and a tourist destination
The Colorado National Monument near Grand Junction is made up of high desert canyons and sandstone rock formations
Köppen climate types of Colorado, using 1991-2020 climate normals.
Breckenridge naturalist Edwin Carter with a mounted gray wolf killed in the Colorado Rockies, ca. 1890–1900.
An enlargeable map of the 64 counties of the State of Colorado
An enlargeable map of the 17 core-based statistical areas of Colorado
Colorado population density map
Denver Energy Center lies in the Denver financial district along 17th Street, known as the Wall Street of the West
Corn growing in Larimer County
An oil well in western Colorado
History Colorado Center in Denver
Street art in Denver
The Colorado Rockies baseball club at Coors Field
Empower Field at Mile High in Denver, home field of the Denver Broncos and the Denver Outlaws
Ball Arena, home of the Denver Nuggets, the Colorado Avalanche, and the Colorado Mammoth
Dick's Sporting Goods Park, home of the Colorado Rapids
A Colorado state welcome sign
The main terminal of Denver International Airport evokes the peaks of the Front Range.
The westbound and eastbound California Zephyrs meet in the Glenwood Canyon.
Colorado Christian University
Colorado College
Colorado Mesa University
Colorado School of Mines
Colorado State University
Regis University
The United States Air Force Academy
The University of Colorado Boulder
The University of Denver
Fort Carson
Peterson Space Force Base
United States Air Force Academy
The Southern Ute Tribal Administration Building
The Ute Mountain Ute Tribal Office Complex
Lowry Pueblo in Canyons of the Ancients National Monument
Great Sand Dunes National Park and Preserve
Spruce Tree House in Mesa Verde National Park

It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains.

Colorado is bordered by Wyoming to the north, Nebraska to the northeast, Kansas to the east, Oklahoma to the southeast, New Mexico to the south, and Utah to the west, as well as touching Arizona to the southwest at the Four Corners.

Utah

State in the Mountain West subregion of the Western United States.

Map showing Utah in 1838 when it was part of Mexico, Britannica 7th edition
Brigham Young led the first Mormon pioneers to the Great Salt Lake.
A sketch of Salt Lake City in 1860
Deseret Village recreates Utah pioneer life for tourists.
The Golden Spike where the First Transcontinental Railroad was completed in the U.S. on May 10, 1869, in Promontory, Utah
Children reading in Santa Clara, Utah, in 1940
Utah county boundaries
Köppen climate types of Utah, using 1991-2020 climate normals.
Snow in Rose Park, Salt Lake City
The Rocky Mountain elk is the Utah state mammal.
The California gull is the Utah state bird.
Western black widow spider
Pando, considered one of the heaviest and oldest organisms on Earth.
Joshua trees, yuccas, and cholla cactus occupy the far southwest corner of the state in the Mojave Desert
"Welcome to Utah" sign
Utah population density map
The LDS Salt Lake Temple, the primary attraction in the city's Temple Square
First Presbyterian Church in Salt Lake City
Sri Sri Radha Krishna (Hindu) Temple
The Wasatch Front region has seen large growth and development despite the economic downturn. Shown is the City Creek Center project, a development in downtown Salt Lake City with a price tag of $1.5–2.5 billion.
One out of every 14 flash memory chips in the world is produced in Lehi, Utah.
Zion National Park in southern Utah is one of five national parks in the state.
Farms and ranches
Bryce Canyon National Park Amphitheater (winter view)
Mining has been a large industry in Utah since it was first settled. The Bingham Canyon Mine in Salt Lake County is one of the largest open pit mines in the world.
Salt Lake International Airport is the largest airport in Utah
FrontRunner commuter rail serves select cities from Ogden to Provo via Salt Lake City.
TRAX light rail serves Salt Lake County
Jake Garn (top-right), former Senator of Utah (1974–1993), and astronaut on Space Shuttle flight STS-51-D
The Utah State Capitol, Salt Lake City
The Scott Matheson Courthouse is the seat of the Utah Supreme Court.
The Huntsman Cancer Institute on the campus of the University of Utah in Salt Lake City
The Eyring Science Center on the campus of Brigham Young University in Provo, Utah
The Utah Jazz playing against the Houston Rockets
Robbie Russell playing for Real Salt Lake
Arches National Park
Pariette Wetlands
Little Cottonwood Canyon
Deer Creek Reservoir
American Fork Canyon
Kolob Canyons at Zion National Park
Salt Lake City
Logan
thumb|Ogden
Park City
Provo
Sandy
St. George
Layton
Monument Valley in southeastern Utah. This area was used to film many Hollywood Westerns.
The otherworldly look of the Bonneville Salt Flats has been used in many movies and commercials.

Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to its west by Nevada.

It is a rugged and geographically diverse state at the convergence of three distinct geological regions: the Rocky Mountains, the Great Basin, and the Colorado Plateau.

Clarkdale, Arizona

A slag heap in Clarkdale

Clarkdale (Yavapai: Saupkasuiva ) is a town in Yavapai County, Arizona, United States.

The cement plant was built in 1959 to supply Portland cement for the construction of Glen Canyon Dam and is owned by the Salt River Pima-Maricopa Indian Community.

Glen Canyon National Recreation Area

Golden Cathedral
The Permian through Jurassic stratigraphy of the Colorado Plateau area of southeastern Utah that makes up much of the famous prominent rock formations in protected areas such as Capitol Reef National Park and Canyonlands National Park. From top to bottom: Rounded tan domes of the Navajo Sandstone; layered red Kayenta Formation; cliff-forming, vertically jointed, red Wingate Sandstone; slope-forming, purplish Chinle Formation; layered, lighter-red Moenkopi Formation; and white, layered Cutler Formation sandstone. Picture from Glen Canyon National Recreation Area, Utah.
Houseboat and powerboat in Knowles Canyon on Lake Powell, Glen Canyon National Recreation Area, Utah
Rainbow Bridge National Monument

Glen Canyon National Recreation Area (shortened to Glen Canyon NRA or GCNRA) is a national recreation area and conservation unit of the United States National Park Service that encompasses the area around Lake Powell and lower Cataract Canyon in Utah and Arizona, covering 1,254,429 acre of mostly rugged high desert terrain.

The recreation area is named for Glen Canyon, which was flooded by the Glen Canyon Dam, completed in 1966, and is now mostly submerged beneath the waters of Lake Powell.

Glen Canyon NRA borders Capitol Reef National Park and Canyonlands National Park on the north, Grand Staircase-Escalante National Monument on the west, Vermilion Cliffs National Monument and the northeasternmost reaches of Grand Canyon National Park on the southwest, and the Navajo Nation on the southeast.