The Sonoran Desert ( es, Desierto de Sonora) is a desert in North America and

ecoregion An ecoregion (ecological region) or ecozone (ecological zone) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas of ...

that covers the northwestern Mexican states of

Sonora Sonora (), officially Estado Libre y Soberano de Sonora ( en, Free and Sovereign State of Sonora), is one of the 31 states which, along with Mexico City, comprise the Federal Entities of Mexico. The state is divided into 72 municipalities; the ...

Baja California Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...

, and

Baja California Sur Baja California Sur (; 'South Lower California'), officially the Free and Sovereign State of Baja California Sur ( es, Estado Libre y Soberano de Baja California Sur), is the least populated state and the 31st admitted state of the 32 federal ent ...

, as well as part of the

southwestern United States 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, N ...

(in

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

and

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...

). It is the hottest desert in both Mexico and the United States. It has an area of . In phytogeography, the Sonoran Desert is within the Sonoran

Floristic province A phytochorion, in phytogeography, is a geographic area with a relatively uniform composition of plant species. Adjacent phytochoria do not usually have a sharp boundary, but rather a soft one, a transitional area in which many species from both r ...

of the

Madrean Region The Madrean Region (named after the Sierra Madre Occidental) is a floristic region within the Holarctic Kingdom in North America, as delineated by Armen Takhtajan and Robert F. Thorne. It occupies arid or semiarid areas in the southwestern Unite ...

of southwestern North America, part of the

Holarctic realm The Holarctic realm is a biogeographic realm that comprises the majority of habitats found throughout the continents in the Northern Hemisphere. It corresponds to the floristic Boreal Kingdom. It includes both the Nearctic zoogeographical regi ...

of the northern

Western Hemisphere The Western Hemisphere is the half of the planet Earth that lies west of the prime meridian (which crosses Greenwich, London, United Kingdom) and east of the antimeridian. The other half is called the Eastern Hemisphere. Politically, the te ...

. The desert contains a variety of unique

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

plant Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae excl ...

s and

animal Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage ...

s, notably, the

saguaro The saguaro (, ) (''Carnegiea gigantea'') is a tree-like cactus species in the monotypic genus ''Carnegiea'' that can grow to be over tall. It is native to the Sonoran Desert in Arizona, the Mexican state of Sonora, and the Whipple Mountai ...

(''Carnegiea gigantea'') and organ pipe cactus (''Stenocereus thurberi''). The Sonoran Desert is clearly distinct from nearby deserts (e.g., the

Great Basin The Great Basin is the largest area of contiguous endorheic watersheds, those with no outlets, in North America. It spans nearly all of Nevada, much of Utah, and portions of California, Idaho, Oregon, Wyoming, and Baja California. It is noted fo ...

, Mojave, and

Chihuahuan desert The Chihuahuan Desert ( es, Desierto de Chihuahua, ) 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 lo ...

s) because it provides subtropical warmth in winter and two seasons of rainfall (in contrast, for example, to the Mojave's dry summers and cold winters). This creates an extreme contrast between aridity and moisture.

Location

The Sonoran desert wraps around the northern end of the

Gulf of California The Gulf of California ( es, Golfo de California), also known as the Sea of Cortés (''Mar de Cortés'') or Sea of Cortez, or less commonly as the Vermilion Sea (''Mar Bermejo''), is a marginal sea of the Pacific Ocean that separates the Baja C ...

, from

( El Vizcaíno Biosphere Reserve in central and Pacific west coast, Central Gulf Coast subregion on east to southern tip), north through much of

, excluding the central northwest mountains and Pacific west coast, through southeastern California and southwestern and southern Arizona to western and central parts of

. It is bounded on the west by the

Peninsular Ranges The Peninsular Ranges (also called the Lower California province) are a group of mountain ranges that stretch from Southern California to the southern tip of the Baja California peninsula; they are part of the North American Coast Ranges, which ...

, which separate it from the

California chaparral and woodlands The California chaparral and woodlands is a terrestrial ecoregion of southwestern Oregon, northern, central, and southern California (United States) and northwestern Baja California (Mexico), located on the west coast of North America. It is a ...

(northwest) and

Baja California Desert The Baja California Desert ( es, Desierto de Baja California) is a desert ecoregion of Mexico's Baja California Peninsula. This ecoregion occupies the western portion of the Baja California peninsula, and occupies most of the Mexican states of B ...

(Vizcaino subregion, central and southeast) ecoregions of the Pacific slope. The Gulf of California xeric scrub ecoregion lies south of the Sonoran desert on the Gulf of California slope of the Baja California Peninsula. To the north in California and northwest Arizona, the Sonoran Desert transitions to the colder-winter, higher-elevation Mojave,

, and

Colorado Plateau The Colorado Plateau, also known as the Colorado Plateau Province, is a physiographic and desert region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. This province covers an area o ...

deserts. The

coniferous Conifers are a group of cone-bearing seed plants, a subset of gymnosperms. Scientifically, they make up the division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single extant class, Pinopsida. All ext ...

Arizona Mountains forests are to the northeast. The

Chihuahuan Desert The Chihuahuan Desert ( es, Desierto de Chihuahua, ) 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 lo ...

and Sierra Madre Occidental pine–oak forests are at higher elevations to the east. To the south the

Sonoran–Sinaloan transition subtropical dry forest The Sonoran–Sinaloan transition subtropical dry forest is a tropical dry broadleaf forest ecoregion in northwestern Mexico. Geography This ecoregion forms a transition belt between the Sonoran Desert to the north and the Sinaloan dry forests ...

is the transition zone from the Sonoran Desert to the

tropical dry forests The tropical and subtropical dry broadleaf forest is a habitat type defined by the World Wide Fund for Nature and is located at tropical and subtropical latitudes. Though these forests occur in climates that are warm year-round, and may receive ...

of the Mexican state of

Sinaloa Sinaloa (), officially the Estado Libre y Soberano de Sinaloa ( en, Free and Sovereign State of Sinaloa), is one of the 31 states which, along with Mexico City, comprise the Federal Entities of Mexico. It is divided into 18 municipalities and ...

Sub-regions

The desert's sub-regions include the

Colorado Desert California's Colorado Desert is a part of the larger Sonoran Desert. It encompasses approximately , including the heavily irrigated Coachella and Imperial valleys. It is home to many unique flora and fauna. Geography and geology The Colorado D ...

of southeastern California; and the

Yuma Desert The Yuma Desert is a lower-elevation section of the Sonoran Desert in the southwestern United States and the northwest of Mexico. It lies in the Salton basin. The desert contains areas of sparse vegetation and has notable areas of sand dunes. With ...

east of the north-to-south section of the

Colorado River The Colorado River ( es, Río Colorado) is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and northern Mexico. The river drains an expansive, arid watershed that encompasses parts of seven U.S. s ...

in southwest Arizona. In the 1957 publication ''Vegetation of the Sonoran Desert'', Forrest Shreve divided the Sonoran Desert into seven regions according to characteristic vegetation: Lower Colorado Valley, Arizona Upland, Plains of Sonora, Foothills of Sonora, Central Gulf Coast, Vizcaíno Region, and Magdalena Region. Many ecologists consider Shreve's Vizcaíno and Magdalena regions, which lie on the western side of the Baja California Peninsula, to be a separate

, the

. Within the southern Sonoran Desert in Mexico is found the

Gran Desierto de Altar The Gran Desierto de Altar is one of the major sub-ecoregions of the Sonoran Desert, located in the State of Sonora, in northwest Mexico. It includes the only active erg dune region in North America. The desert extends across much of the northern ...

, with the

El Pinacate y Gran Desierto de Altar Biosphere Reserve El Pinacate y Gran Desierto de Altar Biosphere Reserve ( es, Reserva de la Biosfera El Pinacate y Gran Desierto de Altar) is a biosphere reserve and UNESCO World Heritage Site managed by the federal government of Mexico, specifically by Sec ...

, extending of desert and mountainous regions. The biosphere reserve includes the only active

erg The erg is a unit of energy equal to 10−7joules (100 nJ). It originated in the Centimetre–gram–second system of units (CGS). It has the symbol ''erg''. The erg is not an SI unit. Its name is derived from (), a Greek word meaning 'work' o ...

dune region in North America. The nearest city to the biosphere reserve is Puerto Peñasco ('Rocky Point') in the state of

Mexico Mexico (Spanish language, Spanish: México), officially the United Mexican States, is a List of sovereign states, country in the southern portion of North America. It is borders of Mexico, bordered to the north by the United States; to the so ...

. ;Sub-regions Sonoran Desert sub-regions include: *

Lechuguilla Desert The Lechuguilla Desert is a small desert located in southwestern Arizona near the United States, U.S.-Mexico border. It is considered to be part of the Lower Colorado Valley region of the Sonoran Desert. It lies in a north–south direction betwe ...

* Tonopah Desert *

Yuha Desert The Yuha Desert is a section of the Sonoran Desert located in the Imperial Valley of California; south of Interstate 8, west of El Centro, and north of the international border. Unique aspects of the Yuha Desert include the Oyster Shell Beds, De A ...

Climate

The Sonoran desert has an arid subtropical climate. In the lower-elevation portions of the desert, temperatures are warm year-round, and rainfall is infrequent and irregular, often less than 90 mm (approx. 3.5”) annually. The Arizona uplands are also warm year-round, but they receive 100–300 mm (approx. 4-12”) of average annual rainfall, which falls in a more regular bi-seasonal pattern.

Flora

Many plants not only survive, but thrive in the harsh conditions of the Sonoran Desert. Many have evolved to have specialized adaptations to the desert climate. The Sonoran Desert's bi-seasonal rainfall pattern results in more plant species than any other desert in the world. The Sonoran Desert includes plant genera and species from the

agave ''Agave'' (; ; ) is a genus of monocots native to the hot and arid regions of the Americas and the Caribbean, although some ''Agave'' species are also native to tropical areas of North America, such as Mexico. The genus is primarily known for ...

family,

palm Palm most commonly refers to: * Palm of the hand, the central region of the front of the hand * Palm plants, of family Arecaceae **List of Arecaceae genera * Several other plants known as "palm" Palm or Palms may also refer to: Music * Palm (ba ...

family,

cactus A cactus (, or less commonly, cactus) is a member of the plant family Cactaceae, a family comprising about 127 genera with some 1750 known species of the order Caryophyllales. The word ''cactus'' derives, through Latin, from the Ancient Gree ...

family,

legume A legume () is a plant in the family Fabaceae (or Leguminosae), or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock for ...

family, and numerous others. The Sonoran is the only place in the world where the famous saguaro cactus (''Carnegiea gigantea'') grows in the wild. Cholla (''Cylindropuntia'' spp.), beavertail (''Opuntia basilaris''),

hedgehog A hedgehog is a spiny mammal of the subfamily Erinaceinae, in the eulipotyphlan family Erinaceidae. There are seventeen species of hedgehog in five genera found throughout parts of Europe, Asia, and Africa, and in New Zealand by introductio ...

(''Echinocereus'' spp.), fishhook (''Ferocactus wislizeni''), prickly pear (''Opuntia'' spp.), nightblooming cereus (''Peniocereus'' spp.), and

organ pipe An organ pipe is a sound-producing element of the pipe organ that resonates at a specific pitch when pressurized air (commonly referred to as ''wind'') is driven through it. Each pipe is tuned to a specific note of the musical scale. A set o ...

(''Stenocereus thurberi'') are other taxa of cacti found here. Cactus provides food and homes to many desert mammals and birds, with showy flowers in reds, pinks, yellows, and whites, blooming most commonly from late March through June, depending on the species and seasonal temperatures.

Creosote bush ''Larrea tridentata'', called creosote bush and greasewood as a plant, chaparral as a medicinal herb, and ''gobernadora'' (Spanish for "governess") in Mexico, due to its ability to secure more water by inhibiting the growth of nearby plants. In S ...

(''Larrea tridentata'') and bur sage (''Ambrosia dumosa'') dominate valley floors.

Indigo bush The common name indigo bush can refer to plants in any of several genera in the legume family, including: *''Amorpha'', native to North America *''Dalea'' *'' Psorothamnus'' See also *False indigo False indigo is a common name for several plants ...

(''Psorothamnus fremontii'') and

Mormon tea ''Ephedra'' is a genus of gymnosperm shrubs. The various species of ''Ephedra'' are widespread in many arid regions of the world, ranging across southwestern North America, southern Europe, northern Africa, southwest and central Asia, northe ...

are other shrubs that may be found. Wildflowers of the Sonoran Desert include desert sand verbena (''Abronia villosa''), desert sunflower (''Geraea canescens''), and evening primroses. Prosopis velutina Anza-Borrego

Ascending from the valley up bajadas, various subtrees such as velvet mesquite (''Prosopis velutina''), palo verde (''Parkinsonia florida''),

desert ironwood ''Olneya tesota'' is a perennial flowering tree of the family Fabaceae, legumes (peas, beans, etc.), which is commonly known as ironwood, desert ironwood, or palo fierro in Spanish. It is the only species in the monotypic genus ''Olneya''. This ...

(''Olneya tesota''),

desert willow ''Chilopsis'' is a monotypic genus of flowering plants containing the single species ''Chilopsis linearis''. It is known commonly as desert willow

(''Chilopsis linearis'' ssp. ''arcuata''), and crucifixion thorn (''Canotia holacantha'') are common, as well as multi-stemmed

ocotillo ''Fouquieria splendens'' (commonly known as ocotillo (), but also referred to as buggywhip, coachwhip, candlewood, slimwood, desert coral, Jacob's staff, Jacob cactus, and vine cactus) is a plant indigenous to the Sonoran Desert and Chihuahuan ...

(''Fouquieria splendens''). Shrubs found at higher elevations include whitethorn acacia (''Acacia constricta''), fairy duster, and jojoba. In the desert subdivisions found on Baja California, cardon cactus, elephant tree, and boojum tree occur. Washingtonia filifera Anza-Borrego

The

California fan palm ''Washingtonia filifera'', the desert fan palm, California fan palm, or California palm,Flora of North America Association. ''Flora of North America: North of Mexico Volume 22: Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in Part), and Zi ...

(''Washingtonia filifera'') is found in the

section of the Sonoran Desert, the only

native Native may refer to: People * Jus soli, citizenship by right of birth * Indigenous peoples, peoples with a set of specific rights based on their historical ties to a particular territory ** Native Americans (disambiguation) In arts and entert ...

palm in California, among many other introduced

Arecaceae The Arecaceae is a family of perennial flowering plants in the monocot order Arecales. Their growth form can be climbers, shrubs, tree-like and stemless plants, all commonly known as palms. Those having a tree-like form are called palm trees ...

genera and species. It is found at

spring Spring(s) may refer to: Common uses * Spring (season), a season of the year * Spring (device), a mechanical device that stores energy * Spring (hydrology), a natural source of water * Spring (mathematics), a geometric surface in the shape of a h ...

-fed

oases In ecology, an oasis (; ) is a fertile area of a desert or semi-desert environment'ksar''with its surrounding feeding source, the palm grove, within a relational and circulatory nomadic system.” The location of oases has been of critical im ...

, such as in

Anza Borrego Desert State Park Anza-Borrego Desert State Park (, '' AN-zə bə-RAY-goh'') is a California State Park located within the Colorado Desert of southern California, United States. The park takes its name from 18th century Spanish explorer Juan Bautista de Anza and ...

Joshua Tree National Park Joshua Tree National Park is an American national park in southeastern California, east of San Bernardino and Los Angeles and north of Palm Springs. It is named after the Joshua trees (''Yucca brevifolia'') native to the Mojave Desert. Origin ...

, and the

Kofa National Wildlife Refuge The Kofa National Wildlife Refuge is located in Arizona in the southwestern United States, northeast of Yuma and southeast of Quartzsite. The refuge, established in 1939 to protect desert bighorn sheep, encompasses over of the Yuma Desert re ...

Fauna

The Sonoran Desert is home to a wide variety of animals, birds and other creatures. such as the Gila monster,

bobcat The bobcat (''Lynx rufus''), also known as the red lynx, is a medium-sized cat native to North America. It ranges from southern Canada through most of the contiguous United States to Oaxaca in Mexico. It is listed as Least Concern on the ...

mule deer The mule deer (''Odocoileus hemionus'') is a deer indigenous to western North America; it is named for its ears, which are large like those of the mule. Two subspecies of mule deer are grouped into the black-tailed deer. Unlike the related whi ...

antelope jackrabbit The antelope jackrabbit (''Lepus alleni'') is a species of North American hare found in southern Arizona and northwestern Mexico that occupies dry desert areas. Behaviour It is most active during twilight (crepuscular) and during the night (noctu ...

burrowing owl The burrowing owl (''Athene cunicularia''), also called the shoco, is a small, long-legged owl found throughout open landscapes of North and South America. Burrowing owls can be found in grasslands, rangelands, agricultural areas, deserts, or an ...

, greater roadrunner,

western diamondback rattlesnake The western diamondback rattlesnake or Texas diamond-backWright AH, Wright AA. (1957). ''Handbook of Snakes''. Comstock Publishing Associates. (7th printing, 1985). . (''Crotalus atrox'') is a rattlesnake species and member of the viper family, ...

, and elf owl. There are three hundred fifty bird species, 20 amphibian species, over 100 reptile species, 30 native fish species, over 1000 native bee species, and more than 2,000 native plant species found in the desert area. The Sonoran Desert area southeast of

Tucson , "(at the) base of the black ill , nicknames = "The Old Pueblo", "Optics Valley", "America's biggest small town" , image_map = , mapsize = 260px , map_caption = Interactive map ...

and near the Mexican border is vital habitat for the only population of

jaguar The jaguar (''Panthera onca'') is a large cat species and the only living member of the genus ''Panthera'' native to the Americas. With a body length of up to and a weight of up to , it is the largest cat species in the Americas and the th ...

s living within the United States. The

Colorado River Delta The Colorado River Delta is the region where the Colorado River flows into the Gulf of California (also known as the Sea of Cortez) in eastern Mexicali Municipality in the north of the state of Baja California in northwesternmost Mexico. The ...

was once an ecological hotspot within the Sonoran desert due to the Colorado river in this otherwise dry area, but the delta has been greatly reduced in extent due to the damming and use of the river upstream. Species that have higher heat tolerance are able to thrive in the conditions of the Sonoran Desert. One such insect species that has evolved a means to thrive in this environment is Drosophila ''mettleri'', a Sonoran Desert fly. This fly contains a specialized

P450 Cytochromes P450 (CYPs) are a superfamily of enzymes containing heme as a cofactor that functions as monooxygenases. In mammals, these proteins oxidize steroids, fatty acids, and xenobiotics, and are important for the clearance of various compo ...

detoxification system that enables it to nest in the cool region of exudate moistened soil. Thus, the fly is one of few that can tolerate the high desert temperatures and successfully reproduce.

Human population

The Sonoran Desert is home to the cultures of over 17 contemporary Native American tribes, with settlements at

American Indian reservations in California American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...

and

, as well as populations in Mexico. The largest city in the Sonoran Desert is

Phoenix, Arizona Phoenix ( ; nv, Hoozdo; es, Fénix or , yuf-x-wal, Banyà:nyuwá) is the List of capitals in the United States, capital and List of cities and towns in Arizona#List of cities and towns, most populous city of the U.S. state of Arizona, with 1 ...

, with a 2017 metropolitan population of about 4.7 million. Located on the Salt River in central Arizona, it is one of the fastest-growing

metropolitan areas A metropolitan area or metro is a region that consists of a densely populated urban agglomeration and its surrounding territories sharing industries, commercial areas, transport network, infrastructures and housing. A metro area usually ...

in the United States. In 2007 in the Phoenix area, desert was losing ground to

urban sprawl Urban sprawl (also known as suburban sprawl or urban encroachment) is defined as "the spreading of urban developments (such as houses and shopping centers) on undeveloped land near a city." Urban sprawl has been described as the unrestricted growt ...

at a rate of approximately per hour. The next largest cities are

Tucson , "(at the) base of the black ill , nicknames = "The Old Pueblo", "Optics Valley", "America's biggest small town" , image_map = , mapsize = 260px , map_caption = Interactive map ...

, in southern Arizona, with a metro area population of just over 1 million,Table 1: Annual Estimates of the Population of Metropolitan and Micropolitan Statistical Areas: April 1, 2000 to July 1, 2006 (CBSA-EST2006-01)
,

United States Census Bureau The United States Census Bureau (USCB), officially the Bureau of the Census, is a principal agency of the U.S. Federal Statistical System, responsible for producing data about the American people and economy. The Census Bureau is part of th ...

, 2007-04-05. Accessed 2007-09-11 and

Mexicali Mexicali (; ) is the capital city of the Mexican state of Baja California. The city, seat of the Mexicali Municipality, has a population of 689,775, according to the 2010 census, while the Calexico–Mexicali metropolitan area is home to 1,000,0 ...

, with a similarly sized metropolitan population of around 1,000,000. The metropolitan area of

Hermosillo Hermosillo (), formerly called Pitic (as in ''Santísima Trinidad del Pitic'' and ''Presidio del Pitic''), is a city located in the center of the northwestern Mexican state of Sonora. It is the municipal seat of the Hermosillo municipality, the ...

, has a population close to 900,000.

Ciudad Obregón Ciudad Obregón is a city in southern Sonora. It is the state's second largest city after Hermosillo and serves as the municipal seat of Cajeme, as of 2020, the city has a population of 436,484. Ciudad Obregón is south of the state's norther ...

, in the southern part of the desert, has a population of 375,800.

California

The

Coachella Valley , map_image = Wpdms shdrlfi020l coachella valley.jpg , map_caption = Coachella Valley , location = California, United States , coordinates = , width = , boundaries = Salton Sea (southeast), Santa Rosa Mountains (southwest), San Jacin ...

, located in the

section of the Sonoran Desert, has a population of 365,000. Several famous

Southern California Southern California (commonly shortened to SoCal) is a geographic and cultural region that generally comprises the southern portion of the U.S. state of California. It includes the Los Angeles metropolitan area, the second most populous urban ...

desert resort cities such as

Palm Springs Palm Springs (Cahuilla: ''Séc-he'') is a desert resort city in Riverside County, California, United States, within the Colorado Desert's Coachella Valley. The city covers approximately , making it the largest city in Riverside County by land ...

and Palm Desert are located here. Gateway to the Springs

During the winter months, from November to April, the daytime temperatures in the Coachella Valley range from 70 °F (21 °C) to 90 °F (32 °C) and corresponding nighttime lows range from 46 °F (8 °C) to 68 °F (20 °C) making it a popular winter resort destination. Due to its warm year-round climate

citrus ''Citrus'' is a genus of flowering trees and shrubs in the rue family, Rutaceae. Plants in the genus produce citrus fruits, including important crops such as oranges, lemons, grapefruits, pomelos, and limes. The genus ''Citrus'' is native to ...

and subtropical fruits such as mangoes, figs, and dates are grown in the Coachella Valley and adjacent

Imperial Valley , photo = Salton Sea from Space.jpg , photo_caption = The Imperial Valley below the Salton Sea. The US-Mexican border runs diagonally across the lower left of the image. , map_image = Newriverwatershed-1-.jpg , map_caption = Map of Imperial ...

. The Imperial Valley has a total population of over 180,000 and has a similar climate to that of the Coachella Valley. Other cities include

Borrego Springs Borrego Springs (''Borrego'', Spanish for "Sheep") is a census-designated place (CDP) in San Diego County, California. The population was 3,429 at the 2010 census, up from 2,535 at the 2000 census, made up of both seasonal and year-round resid ...

Indio Indio may refer to: Places * Indio, Bovey Tracey, an historic estate in Devon, England * Indio, California, a city in Riverside County, California, United States People with the name * Indio (musician), Canadian musician Gordon Peterson * Índi ...

, Coachella,

Calexico Calexico () is a city in southern Imperial County, California. Situated on the Mexican border, it is linked economically with the much larger city of Mexicali, the capital of the Mexican state of Baja California. It is about east of San Diego ...

, El Centro,

Imperial Imperial is that which relates to an empire, emperor, or imperialism. Imperial or The Imperial may also refer to: Places United States * Imperial, California * Imperial, Missouri * Imperial, Nebraska * Imperial, Pennsylvania * Imperial, Texas ...

, and

Blythe The name Blythe ( or ) derives from Old English ''bliþe'' ("joyous, kind, cheerful, pleasant"; modern ''blithe''), and further back from Proto-Germanic ''*blithiz'' ("gentle, kind"). People *Blythe (given name), including a list of people named ...

United States–Mexico border region

Straddling the US-Mexican border with low levels of human-installed security, the Sonoran desert is a route for unauthorized entry across the border. The harsh conditions mean that the 3-to-5-day march, usually moving at night to minimize exposure to the heat, sometimes results in death.

Protected areas

There are many National Parks and Monuments; federal and state

nature reserve A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, or features of geological o ...

s and

wildlife refuge A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, or features of geological or ...

s; state, county, and city parks; and government or nonprofit group operated

natural history museum A natural history museum or museum of natural history is a scientific institution with natural history collections that include current and historical records of animals, plants, fungi, ecosystems, geology, paleontology, climatology, and more. ...

s, science research institutes, and

botanical garden A botanical garden or botanic gardenThe terms ''botanic'' and ''botanical'' and ''garden'' or ''gardens'' are used more-or-less interchangeably, although the word ''botanic'' is generally reserved for the earlier, more traditional gardens, an ...

s and desert landscape

garden A garden is a planned space, usually outdoors, set aside for the cultivation, display, and enjoyment of plants and other forms of nature. The single feature identifying even the wildest wild garden is ''control''. The garden can incorporate bot ...

s. * Index: Protected areas of the Sonoran Desert * Index: Protected areas of the Colorado Desert ;Sonoran Desert protected areas include: * Arizona–Sonora Desert Museum *

Sonoran Desert National Monument Sonoran Desert National Monument is south of Goodyear and Buckeye and east of Gila Bend, Arizona. Created by Presidential proclamation on January 17, 2001, the monument is managed by the U.S. Bureau of Land Management as part of the Natio ...

The

was created in 2001 in Arizona, to enhance protection of the unique resources of the Sonoran Desert, with .
:Reference
Sonoran Desert National Monument
, Bureau of Land Management, U. S. Department of the Interior. Accessed on line June 17, 2009. *

Boyce Thompson Arboretum State Park Boyce Thompson Arboretum is the oldest and largest botanical garden in the state of Arizona. It is one of the oldest botanical institutions west of the Mississippi River. Founded in 1924 as a desert plant research facility and “living museum ...

– ''Sonoran Desert flora arboretum'' * Anza–Borrego Desert State Park *

Organ Pipe Cactus National Monument Organ Pipe Cactus National Monument is a U.S. national monument and UNESCO biosphere reserve located in extreme southern Arizona that shares a border with the Mexican state of Sonora. The park is the only place in the United States where the ...

* Saguaro National Park *

* Reserva de la Biosfera el Pinacate y Gran Desierto de Altar – ''Pinacate National Park, in Sonora, Mexico'' * Indio Hills Palms State Reserve *

Coachella Valley National Wildlife Refuge Coachella Valley National Wildlife Refuge is a protected area in Riverside County, California's Coachella Valley. It lies within the unincorporated community of Thousand Palms, just north of Palm Desert. The refuge contains the majority of cri ...

Cabeza Prieta National Wildlife Refuge Cabeza Prieta National Wildlife Refuge (CPNWR) is located in southwestern Arizona in the United States, along of the Mexico–United States border. It is bordered to the north and to the west by the Barry M. Goldwater Air Force Range, to the s ...

South Mountain Park South Mountain Park in Phoenix, Arizona is the largest municipal park in the United States, and one of the largest urban parks in North America and in the world. It has been designated as a Phoenix Point of Pride. Geography and ecology South ...

* Sonoran Arthropod Studies Institute

References

Parks and recreation areas

Saguaro National Park: official website

Anza–Borrego Desert State: official website

Organ Pipe Cactus National Monument: official website

Arizona State Parks: official website (desert plants)
{{Authority control Basin and Range Province Deserts and xeric shrublands in the United States Deserts and xeric shrublands Deserts of Arizona Deserts of California Deserts of Mexico Deserts of North America Deserts of the Lower Colorado River Valley Ecoregions of Mexico Ecoregions of the United States Floristic provinces Geography of Southern California Geologic provinces of California Gulf of California Madrean Region Physiographic sections Physiographic regions of Mexico Physiographic regions of the United States Desert, Sonoran Nearctic ecoregions

Location

Sub-regions

Climate

Flora

Fauna

Human population

California

United States–Mexico border region

Protected areas

See also

References

External links

Parks and recreation areas