The Sonoran Desert is a hot desert in North America and ecoregion that covers the northwestern Mexican states of Sonora, Baja California, and Baja California Sur, as well as part of the southwestern United States. It is the hottest desert in both Mexico and the United States. It has an area of 260,000 square kilometers (100,000 sq mi).
The Chihuahuan Desert is a desert ecoregion designation covering parts of northern Mexico and the southwestern United States. It occupies much of far West Texas, the middle to lower Rio Grande Valley and the lower Pecos Valley in New Mexico, and a portion of southeastern Arizona, as well as the central and northern portions of the Mexican Plateau. It is bordered on the west by the Sonoran Desert, the Colorado Plateau, and the extensive Sierra Madre Occidental range, along with northwestern lowlands of the Sierra Madre Oriental range. Its largest, continual expanse is located in Mexico, covering a large portion of the state of Chihuahua, along with portions of Coahuila, north-eastern Durango, the extreme northern part of Zacatecas, and small western portions of Nuevo León. With an area of about 501,896 km2 (193,783 sq mi), it is the largest hot desert in North America. The desert is fairly young, existing for only 8000 years.
Great Sand Dunes National Park and Preserve is a national park of the United States that conserves an area of large sand dunes on the eastern edge of the San Luis Valley, and an adjacent national preserve in the Sangre de Cristo Range, in south-central Colorado. The park was originally designated Great Sand Dunes National Monument on March 17, 1932, by President Herbert Hoover. The original boundaries protected an area of 35,528 acres. A boundary change and redesignation as a national park and preserve was authorized on November 22, 2000, and then established on September 24, 2004. The park encompasses 107,342 acres while the preserve protects an additional 41,686 acres for a total of 149,028 acres. The recreational visitor total was 527,546 in 2019.
Sky islands are isolated mountains surrounded by radically different lowland environments. The term originally referred to those found on the Mexican Plateau and has extended to similarly isolated high-elevation forests. The isolation has significant implications for these natural habitats. The American Southwest region began warming up between c. 20,000 and 10,000 years BP and atmospheric temperatures increased substantially, resulting in the formation of vast deserts that isolated the sky islands. Endemism, altitudinal migration, and relict populations are some of the natural phenomena to be found on sky islands.
The Madrean Sky Islands are enclaves of Madrean pine–oak woodlands, found at higher elevations in a complex of small mountain ranges in southern and southeastern Arizona, southwestern New Mexico, and northwestern Mexico. The sky islands are surrounded at lower elevations by the Sonoran and Chihuahuan deserts. The northern west–east perimeter of the sky island region merges into the higher elevation eastern Mogollon Rim and the White Mountains of eastern Arizona.
Gila is a census-designated place in Grant County, New Mexico, United States. It is 48 kilometres (30 mi) northwest of the county seat, Silver City. Its population was 314 as of the 2010 census. The community is located in the irrigated valley of the Gila River in the midst of hilly and mountainous semi-arid terrain. The townsite was sporadically populated by the Apache, Spanish and Mexican colonists, and American mountain men prior to the rise to prominence of the million-acre Lyons & Campbell Ranch. The ranch established its headquarters in Gila in 1890 and was one of the largest ranches in the United States. The headquarters building is on the National Register of Historic Places.
The Animas Mountains are a small mountain range in Hidalgo County, within the "Boot-Heel" region of far southwestern New Mexico, in the United States. They extend north–south for about 30 miles (50 km) along the Continental Divide, from near the town of Animas to a few miles north of the border with Mexico. The range is about 12 miles (20 km) wide at its widest. The highest point of the range is the southern summit of the mile-long Animas Peak massif, 8,565 feet (2,611 m). The Animas Mountains lie between the Animas Valley on the west and the Playas Valley on the east. Nearby ranges include the Peloncillo Mountains, across the Animas Valley, and the Big Hatchet and Little Hatchet Mountains, across the Playas Valley. Physiographically, the range divides into two parts. The compact southern part, which includes Animas Peak, is higher and wider, rising up to 4,000 ft above the nearby valleys. It has a sky island character, with dense coniferous forests at the higher elevations. The longer, narrow northern portion is lower, reaching only 7,310 ft at Gillespie Peak, and is characterized by grassland and piñon-juniper woods and shrubs. The Animas Mountains lie near the Chihuahuan Desert, the Sonoran Desert, the Sierra Madre Occidental of Mexico, and the mountains surrounding the headwaters of the Gila River. Biotic influences from these regions, as well as the more distant Rocky Mountains, give the southern portion of the range a great diversity of species, including "approximately 130 species of birds, 60 species of mammals, and 40 species of reptiles."
The Purgatoire River, also known as the Purgatory and Picketwire River, is in southeastern Colorado, United States. The river originates in the high mountains of the Culebra Range. Several tributaries merge near Weston in Las Animas County and the river flows east-northeastward 196 miles (315 km) to a confluence with the Arkansas River near Las Animas in Bent County, Colorado. The Purgatoire River drains an area of 3,449 square miles (8,930 km2), mostly in Colorado but a small percentage of the watershed is in New Mexico. The Purgatoire River watershed is lightly populated. Population has been declining since 1920 as former coal mining and agricultural communities have become ghost towns.
The Trout Creek Mountains are a remote, semi-arid Great Basin mountain range mostly in southeastern Oregon and partially in northern Nevada in the United States. The range's highest point is Orevada View Benchmark, 8,506 feet (2,593 m) above sea level, in Nevada. Disaster Peak, elevation 7,781 feet (2,372 m), is another prominent summit in the Nevada portion of the mountains.
Animas is an unincorporated community and census-designated place (CDP) in west-central Hidalgo County, New Mexico, United States, in the southwestern corner of the state. As of the 2010 census it had a population of 237.
The Peloncillo Mountains of Cochise County is a mountain range in northeast Cochise County, Arizona. A northern north–south stretch of the range extends to the southern region of Greenlee County on the northeast, and a southeast region of Graham County on the northwest. The north stretch of the Peloncillos forms the border between the two counties. It lies east and northeast of the Willcox Playa, and the San Simon Valley.
The Peloncillo Mountains of Hidalgo County,, is a major 35-mile (56 km) long mountain range southwest of New Mexico's Hidalgo County, and also part of the New Mexico Bootheel region. The range continues to the northwest into Arizona as the Peloncillo Mountains of Cochise County, Arizona. The extreme southwest corner of the range also lies in Arizona. It is a linear range bordering the linear San Bernardino Valley of southeast Cochise County, Arizona.
The Sierra San Luis range is a mountain range in northwest Chihuahua, northeast Sonora, Mexico at the northern region of the Sierra Madre Occidental cordillera. The region contains sky island mountain ranges, called the Madrean Sky Islands, some separated from the Sierra Madre Occidental proper, and occurring in the northeastern Sonoran Desert, and extreme west-northwestern Chihuahuan Desert. Many of the ranges occur in southeast Arizona.
The Pajarito Mountains is a small mountain range of western Santa Cruz County, Arizona, United States, that extend south into Sonora, Mexico. The range is adjacent the Atascosa Mountains at its north, with both ranges in the center of a north-south sequence of ranges called the Tumacacori Highlands. The Highlands have the Tumacacori Mountains at the north, and south of the U.S.-Mexico border, the Sierra La Esmeralda range. The Tumacacori Highlands are part of a regional conservancy study of "travel corridors" for cats, called Cuatro Gatos, Four Cats, for mountain lions, ocelot, bobcat, and jaguar.
The West Silver Bell Mountains are a small 10 mile (16 km) long mountain range of south-central Arizona, United States. The range lies in the north-central arid Sonoran Desert; the Madrean Sky Islands region of southeast Arizona, around Tucson is adjacent to the southeast.
The Sierra del Carmen, also called the Sierra Maderas del Carmen, is a northern finger of the Sierra Madre Oriental in the state of Coahuila, Mexico. The Sierra begins at the Rio Grande at Big Bend National Park and extends southeast for about 72 kilometres (45 mi), reaching a maximum elevation of 2,720 metres (8,920 ft). Part of the Sierra del Carmen is protected in the Maderas del Carmen Biosphere Reserve as part of a bi-national effort to conserve a large portion of the Chihuahua Desert in Mexico and Texas.
The Mesa de Maya is a prominent volcanic tableland rising 500 feet (150 m) to 1,200 feet (370 m) above the Great Plains in southeastern Colorado. A narrow finger of the mesa extends eastward through the northeastern corner of New Mexico and a few miles into Oklahoma where it is known as the Black Mesa. The elevation of the Mesa de Maya ranges from 4,800 feet (1,500 m) at its easternmost extension to 6,902 feet (2,104 m) in the west.
Jacumba Valley is a valley in San Diego and Imperial Counties, California. Its head is at 32°37′00″N116°10′07″W Carrizo Creek has its source in Jacumba Valley, 1.2 miles north of the California-Mexico State boundary, at 32°38′09″N116°07′05″W at an elevation of 3,210 feet, on the west side of the divide between Jacumba Valley and the valley of upper Boulder Creek. Carrizo Creek flows west then north northwest through Jacumba Valley to its mouth at the head of Carrizo Gorge. Just south of the Jacumba and In-ko-pah Mountains, the terrain consists of large, flat desert plains and hills of granite boulders. The wider region, including the Jacumba Wilderness, which sits just east of the valley, has been greatly affected by the construction of the US/Mexico border and has become a site of great numbers of migrations along migrant paths.
The Janos Biosphere Reserve is a nature reserve in Janos, Chihuahua, Mexico. It protects a prairie ecosystem best known for its recovering and reintroduced species most notably the herd of American bison which became the first re-established in Mexico. It is the first federally protected area of Mexico with the main objective of protecting a grassland ecosystem.
The Sangre de Cristo Land Grant in the San Luis Valley of southern Colorado and northern New Mexico consists of 1,000,000 acres (4,000 km2) of mostly arid land. It was awarded by the government of New Mexico to the Beaubien family in 1843. The land grant was originally settled by Hispanics from New Mexico. Since the incorporation of the area of the grant into the United States in 1848, legal disputes between the descendants of the Hispanic settlers and Anglo ranchers about ownership of and access to some of the land in the grant area have been frequent and continued into the 21st century.
