Geography of Texas

Last updated
Geography of Texas
Texas topographic map-en.svg
Region South Central United States
Coordinates 31°N100°W / 31°N 100°W / 31; -100
Area
  Total268,581 sq mi (695,620 km2)
Coastline367 mi (591 km)
Highest point Guadalupe Peak, 8,749 feet (2,667 m)
Lowest point Gulf of Mexico, sea level

The geography of Texas is diverse and large. Occupying about 7% of the total water and land area of the U.S., [1] it is the second largest state after Alaska, and is the southernmost part of the Great Plains, which end in the south against the folded Sierra Madre Oriental of Mexico. Texas is in the South Central United States of America, and is considered to form part of the U.S. South and also part of the U.S. Southwest. [2]

Contents

By residents, the state is generally divided into North Texas, East Texas, Central Texas, South Texas, West Texas and, sometimes, the Panhandle, but according to the Texas Almanac , Texas has four major physical regions: Gulf Coastal Plains, Interior Lowlands, Great Plains, and Basin and Range Province. This has been cited as the difference between human geography and physical geography, although the fact that Texas was granted the prerogative to divide into as many as five U.S. states may be a historical motive for Texans defining their state as containing exactly five regions. [3]

Some regions in Texas are more associated with the American Southeast (primarily East Texas, Central Texas, and North Texas), while the Panhandle is considered by many to have more in common with parts of the plains Midwest than either the South or Southwest. Geographically and culturally, El Paso is closer to New Mexico or Arizona than it is to Austin or to East Texas. The size of Texas prohibits easy categorization of the entire state wholly in any recognized region of the United States, and even cultural diversity among regions of the state makes it difficult to treat Texas as a region in its own right.

Physical geography

Texas covers a total area of 268,581 square miles (695,622 km2). The longest straight-line distance is from the northwest corner of the panhandle to the Rio Grande river just below Brownsville, 801 miles (1,289 km). [1] The greatest east–west distance is 773 miles (1,244 km) from the extreme eastward bend in the Sabine River in Newton County to the extreme western bulge of the Rio Grande just above El Paso. [4] The largest continental state is so expansive that El Paso, in the western corner of the state, is closer to San Diego, California, than to the Houston/Beaumont area, near the Louisiana state line; while Orange, on the border with Louisiana, is closer to Jacksonville, Florida, than it is to El Paso. Texarkana, in the northeastern corner of the state, is about the same distance from Chicago, Illinois, as it is from El Paso, and Dalhart, in the northwestern corner of the state, is closer to the state capitals of Kansas, Nebraska, Colorado, New Mexico, Oklahoma and Wyoming than it is to Austin, its own state capital. [5]

The geographic center of Texas is about 15 miles (24 km) northeast of Brady in northern McCulloch County. Guadalupe Peak, at 8,749 feet (2,666.7 m) above sea level, is the highest point in Texas, the lowest being sea level where Texas meets the Gulf of Mexico. [6] Texas has five state forests and 120 state parks totalling over 605,000 acres (2,450 km2). [7] There are 3,700 named streams and 15 major river systems flowing through 191,000 miles (307,000 km) of Texas, supporting over 212 reservoirs. [8]

With 10 climatic regions, 14 soil regions, and 11 distinct ecological regions, regional classification becomes problematic with differences in soils, topography, geology, rainfall, and plant and animal communities. [9]

Coast and estuaries

Much of the 367-mile (591 km) Gulf coastline of Texas is paralleled by the Texas barrier islands, many of which enclose a series of estuaries where the state's rivers mix with water from the Gulf of Mexico. These water bodies include some of the largest and most ecologically productive coastal estuaries in the United States and contribute significantly to the ecological and economic resources of Texas. [10]

Coastal Plains

Caddo Lake Caddo Lake- Cypress.jpg
Caddo Lake

The Gulf Coastal Plains extends from the Gulf of Mexico inland to the Balcones Fault and the Eastern Cross Timbers. This large area stretches from the cities of Paris to San Antonio to Del Rio but shows a large variety in vegetation. Ranging from 20 to 58 inches (510 to 1,470 mm) of annual rainfall, this is a nearly level, drained plain dissected by streams and rivers flowing into coastal estuaries and marshes. Windblown sands and dunes, grasslands, oak mottes and salt marshes make up the seaward areas. [11] National Parks include Big Thicket National Preserve, Padre Island National Seashore and the Palo Alto Battlefield National Historic Site. [12]

North Central Plains

Looking north at the Caprock Escarpment. Caprock Escarpment.jpg
Looking north at the Caprock Escarpment.

The North Central Plains are bounded by the Caprock Escarpment to the west, the Edwards Plateau to the south, and the Eastern Cross Timbers to the east. This area includes the North Central Plains around the cities of Abilene and Wichita Falls, the Western Cross Timbers to the west of Fort Worth, the Grand Prairie, and the Eastern Cross Timbers to the east of Dallas. With about 35 to 50 inches (890 to 1,270 mm) annual rainfall, gently rolling to hilly forested land is part of a larger pine-hardwood forest of oaks, hickories, elm and gum trees. [11] Soils vary from coarse sands to tight clays or shet rock clays and shales. [13]

Great Plains

Hill Country Texas Hill Country Near I-10, 2004.jpg
Hill Country

The Great Plains include the Llano Estacado, the Panhandle, Edwards Plateau, Toyah Basin, and the Llano Uplift. It is bordered on the east by the Caprock Escarpment in the panhandle and by the Balcones Fault to the southeast. Cities in this region include Midland and Odessa, Lubbock, and Amarillo. The Hill Country is a popular name for the area of hills along the Balcones Escarpment and is a transitional area between the Great Plains and the Gulf Coastal Plains. With about 15 to 31 inches (380 to 790 mm) annual rainfall, the southern end of the Great Plains are gently rolling plains of shrub and grassland, and home to the dramatic Caprock Canyons and Palo Duro Canyon state parks. [11] The largest concentration of playa lakes in the world (nearly 22,000) is on the Southern High Plains of Texas and Eastern New Mexico.

Texas's blackland prairies were some of the first areas farmed in Texas. Highly expansive clays with characteristic dark coloration, called the Houston Black series, occur on about 1.5 million acres (6,000 km2) extending from north of Dallas south to San Antonio. The Professional Soil Scientists Association of Texas has recommended to the State Legislature that the Houston Black series be designated the State soil. The series was established in 1902. [14] National Parks in this area are the Lyndon B. Johnson National Historical Park and the San Antonio Missions National Historical Park. [12]

Mountains and basins

El Capitan El Capitan base 2005-03-12.jpg
El Capitan

The Trans-Pecos Natural Region has less than 12 inches (300 mm) annual rainfall. The most complex Natural Region, it includes Sand Hills, the Stockton Plateau, desert valleys, wooded mountain slopes and desert grasslands. The Basin and Range Province is in West Texas, west of the Pecos River, beginning with the Davis Mountains on the east and the Rio Grande to its west and south. The Trans-Pecos region is the only part of Texas regarded as mountainous and includes seven named peaks in elevation greater than 8,000 feet (2,400 m). This region includes sand hills, desert valleys, wooded mountain slopes and desert grasslands. [11] The vegetation diversity includes at least 268 grass species and 447 species of woody plants. [15] National Parks include the Amistad National Recreation Area, Big Bend National Park, Chamizal National Memorial, Fort Davis National Historic Site, Guadalupe Mountains National Park, and the Rio Grande Wild and Scenic River. [12] This area is part of the Chihuahuan Desert.

Climate

Koppen climate classification types of Texas Texas Koppen.svg
Köppen climate classification types of Texas

Continental, Mountain, and Modified Marine are the three major climatic types of Texas, with no distinguishable boundaries. Modified Marine, or subtropical, dominates the majority of the state. [16] Texas has an annual precipitation range from 60.57 inches (1,538 mm) in Jasper County, East Texas, to 9.43 inches (240 mm) in El Paso. The record high of 120  °F (49  °C ) was reached at Seymour on 12 August 1936, and Monahans on 28 June 1994. The low also ties at −23  °F (−31  °C ) in Tulia on 12 February 1899, and Seminole on 8 February 1933. [17]

Geology

Texas is mostly sedimentary rocks, with East Texas underlain by a Cretaceous and younger sequence of sediments, the trace of ancient shorelines east and south until the active continental margin of the Gulf of Mexico is met.[ citation needed ] This sequence is built atop the subsided crest of the Appalachian Mountains Ouachita Mountains Marathon Mountains zone of Pennsylvanian continental collision, which collapsed when rifting in Jurassic time opened the Gulf of Mexico. West from this orogenic crest, which is buried beneath the Dallas Waco Austin San Antonio trend, the sediments are Permian and Triassic in age. Oil is found in the Cretaceous sediments in the east, the Permian sediments in the west, and along the Gulf coast and out on the Texas continental shelf. A few exposures of Precambrian igneous and metamorphic rocks are found in the central and western parts of the state, and Oligocene volcanic rocks are found in far west Texas, in the Big Bend area. A blanket of Miocene sediments known as the Ogallala formation in the western high plains region is an important aquifer. Texas has no active or dormant volcanoes and few earthquakes, being situated far from an active plate tectonic boundary. The Big Bend area is the most seismically active; however, the area is sparsely populated and suffers minimal damages and injuries, and no known fatalities have been attributed to a Texas earthquake.

Resources

With a large supply of natural resources, Texas is a major agricultural and industrial state, producing oil, cattle, sheep, and cotton. The state also produces poultry, eggs, dairy products, greenhouse and nursery products, wheat, hay, rice, sugar cane, and peanuts, and a range of fruits and vegetables. [18]

Regions

There are several different methods used to describe the geographic and geological differences within the state, and there are often subdivisions within a region which more accurately describe both the terrain and the culture. [20] Because there is no single standard for subdividing the regions of Texas, many accepted areas either overlap or seem to contradict others. All are included for completeness.

This MECE (mutually exclusive and collectively exhaustive) partition of the 254 counties into 12 economic regions is used by the Texas comptroller for various analysis and reporting purposes. Texas Economic Regions 2022.svg
This MECE (mutually exclusive and collectively exhaustive) partition of the 254 counties into 12 economic regions is used by the Texas comptroller for various analysis and reporting purposes.

Geographical regions that extend into Texas

See also

Related Research Articles

<span class="mw-page-title-main">Texas panhandle</span> Region in Texas, United States

The Texas panhandle is a region of the U.S. state of Texas consisting of the northernmost 26 counties in the state. The panhandle is a square-shaped area bordered by New Mexico to the west and Oklahoma to the north and east. It is adjacent to the Oklahoma Panhandle, land which Texas previously claimed. The 1820 Missouri Compromise declared no slavery would be allowed in states admitted from the Louisiana Purchase above 36°30′ north latitude. Texas was annexed in 1845 from still more westerly land. The Compromise of 1850 removed territory north of this line from Texas, and set the border between the Texas Pandhandle and the New Mexico Territory at the 103rd meridian west. The eastern border at the 100th meridian west was inherited from the Adams–Onís Treaty of 1819, which defined the border between the United States and New Spain. The Handbook of Texas defines the southern border of Swisher County as the southern boundary of the Texas Panhandle region.

<span class="mw-page-title-main">Llano Estacado</span> Southwestern United States in New Mexico and Texas

The Llano Estacado, sometimes translated into English as the Staked Plains, is a region in the Southwestern United States that encompasses parts of eastern New Mexico and northwestern Texas. One of the largest mesas or tablelands on the North American continent, the elevation rises from 3,000 feet (900 m) in the southeast to over 5,000 feet (1,500 m) in the northwest, sloping almost uniformly at about 10 feet per mile (2 m/km).

<span class="mw-page-title-main">West Texas</span> Region in Texas, United States

West Texas is a loosely defined region in the U.S. state of Texas, generally encompassing the arid and semiarid lands west of a line drawn between the cities of Wichita Falls, Abilene, and Del Rio.

<span class="mw-page-title-main">South Plains</span> Region in Texas, United States

The South Plains is a region in northwest Texas, consisting of 24 counties. The main crop is cotton.

<span class="mw-page-title-main">Guadalupe Mountains</span> Mountain range in the US states of Texas and New Mexico

The Guadalupe Mountains are a mountain range located in West Texas and southeastern New Mexico. The range includes the highest summit in Texas, Guadalupe Peak, 8,751 ft (2,667 m), and the "signature peak" of West Texas, El Capitan, both of which are located within Guadalupe Mountains National Park. The Guadalupe Mountains are bordered by the Pecos River valley and Llano Estacado to the east and north, Delaware Mountains to the south, and Sacramento Mountains to the west. One of the clearest exposures of a prehistoric reef is preserved in the mountain range's bedrock geology. Bedrock contains fossils of reef-dwelling organisms from the Permian period, and the geology is widely studied, mostly by stratigraphers, paleontologists, and Paleoecologists.

<span class="mw-page-title-main">Mescalero Ridge</span> Geographical transition in New Mexico and Texas, the Llano Estacados western border

The Mescalero Ridge forms the western edge of the great Llano Estacado, a vast plateau or tableland in the southwestern United States in New Mexico and Texas. It is the western equivalent of the Caprock Escarpment, which defines the eastern edge of the Llano Estacado.

<span class="mw-page-title-main">High Plains (United States)</span> Subregion of the Great Plains, mainly in the Western United States

The High Plains are a subregion of the Great Plains, mainly in the Western United States, but also partly in the Midwest states of Nebraska, Kansas, and South Dakota, generally encompassing the western part of the Great Plains before the region reaches the Rocky Mountains. The High Plains are located in eastern Montana, southeastern Wyoming, southwestern South Dakota, western Nebraska, eastern Colorado, western Kansas, eastern New Mexico, the Oklahoma Panhandle, and the Texas Panhandle. The southern region of the Western High Plains ecology region contains the geological formation known as Llano Estacado which can be seen from a short distance or on satellite maps. From east to west, the High Plains rise in elevation from around 1,800 to 7,000 ft.

<span class="mw-page-title-main">Geology of Texas</span> Overview of the geology of the U.S. state of Texas

Texas contains a wide variety of geologic settings. The state's stratigraphy has been largely influenced by marine transgressive-regressive cycles during the Phanerozoic, with a lesser but still significant contribution from late Cenozoic tectonic activity, as well as the remnants of a Paleozoic mountain range.

<span class="mw-page-title-main">Trans-Pecos</span> Far west region in US state of Texas

The Trans-Pecos, as originally defined in 1887 by the Texas geologist Robert T. Hill, is the distinct portion of Texas that lies west of the Pecos River. The term is considered synonymous with Far West Texas, a subdivision of West Texas. The Trans-Pecos is part of the Chihuahuan Desert, the largest desert in North America. It is the most mountainous and arid portion of the state, and most of its vast area is sparsely populated. Among the nine counties in the region are the five largest counties by area in Texas and eight of the eleven largest in the state. The area is known for the natural environment of the Big Bend and the gorge of the Rio Grande, part of which has been designated a National Wild and Scenic Rivers System. With the notable exceptions of Big Bend Ranch State Park, Big Bend National Park and the Guadalupe Mountains National Park, the vast majority of the Trans-Pecos region consists of privately owned ranchland. However, most of the region's population reside in the El Paso metropolitan area. Besides El Paso and its metropolitan area, the major cities are Pecos (12,916), Fort Stockton (8,466), and Alpine (6,035). All other settlements have under 5,000 people.

<span class="mw-page-title-main">Caprock Escarpment</span> Geographical transition in Texas and New Mexico

The Caprock Escarpment is a term used in West Texas and Eastern New Mexico to describe the geographical transition point between the level High Plains of the Llano Estacado and the surrounding rolling terrain.

<span class="mw-page-title-main">Caprock Canyons State Park and Trailway</span> Protected area in Briscoe County, Texas with 64 mile trail over former railroad right-of-way

Caprock Canyons State Park and Trailway is a Texas state park located along the eastern edge of the Llano Estacado in Briscoe County, Texas, United States, approximately 100 miles (160 km) southeast of Amarillo. The state park opened in 1982 and is 15,314 acres (6,197 ha) in size, making it the third-largest state park in Texas.

<span class="mw-page-title-main">Eastern New Mexico</span> Region in New Mexico, United States

Eastern New Mexico is a physiographic subregion within the U.S. state of New Mexico. The region is sometimes called the "High Plains," or "Eastern Plains ," and was historically referred to as part of the "Great American Desert". The region is largely coterminous with the portion of the Llano Estacado in New Mexico. Portions of Eastern New Mexico's elevation extend to over 4,000 ft (1,200 m). The region is characterized by flat, largely featureless terrain with the exception of the Pecos River valley and the abrupt breaks along the Mescalero Ridge and northern caprock escarpments of the Llano Estacado. The region typically lacks the high relief of central and northern New Mexico, such as that in the Sangre de Cristo and Sandia mountain ranges. The climate is semi-arid with hot summers and is characterized by significant wind and dust storms in the springtime.

<span class="mw-page-title-main">Climate of Texas</span> Overview of the climate of the U.S. state of Texas

Texas' weather varies widely, from arid in the west to humid in the east. The huge expanse of Texas encompasses several regions with distinctly different climates: Northern Plains, Trans-Pecos Region, Texas Hill Country, Piney Woods, and South Texas. Generally speaking, the part of Texas that lies to the east of Interstate 35 is subtropical, while the portion that lies to the west of Interstate 35 is arid desert.

<span class="mw-page-title-main">Texas wine</span> Wine made from grapes grown in Texas, United States

Texas has a long history of wine production. The sunny and dry climate of the major winemaking regions in the state have drawn comparison to Portuguese wines, in addition to other regions in Europe like Spain, France, and Italy. Some of the earliest recorded Texas wines were produced by Spanish missionaries in the 1650s near El Paso. Texas ranked as the fifth largest wine producing state by 2019.

<span class="mw-page-title-main">Southland, Texas</span> Unincorporated community in Texas, United States

Southland is an unincorporated community in Garza County, Texas, United States. It lies along the eastern edge of the Llano Estacado on U.S. Route 84, twenty miles northwest of Post.

<span class="mw-page-title-main">Buffalo Lake National Wildlife Refuge</span> National Wildlife Refuge near Canyon, Texas

Buffalo Lake National Wildlife Refuge is a protected area in Randall County in the Texas Panhandle. Its shortgrass prairies spill into marshes, woodlands, riparian habitat, croplands, and water-carved canyon walls that together form 7,664 acres (31.02 km2) of homes for migratory and year-round wildlife. The area forms a habitat for black-tailed prairie dogs and burrowing owls, among many other species. Some 175 acres (0.71 km2) of the refuge carries the designation of National Natural Landmark.

<span class="mw-page-title-main">Comanche Trail</span> Comanche travel route in Texas

The Comanche Trail, sometimes called the Comanche War Trail or the Comanche Trace, was a travel route in Texas established by the nomadic Comanche and their Kiowa and Kiowa Apache allies. Although called a "trail," the Comanche Trail was actually a network of parallel and branching trails, always running from one source of good water to another. The trail was especially important from the 1830s to 1850s when the Comanche launched large scale raids from Texas into Mexico. Hundreds of warriors annually followed the trail southward in fall and returned with their booty, mostly livestock, in late winter or spring.

<span class="mw-page-title-main">Paleontology in Texas</span>

Paleontology in Texas refers to paleontological research occurring within or conducted by people from the U.S. state of Texas. Author Marian Murray has said that "Texas is as big for fossils as it is for everything else." Some of the most important fossil finds in United States history have come from Texas. Fossils can be found throughout most of the state. The fossil record of Texas spans almost the entire geologic column from Precambrian to Pleistocene. Shark teeth are probably the state's most common fossil. During the early Paleozoic era Texas was covered by a sea that would later be home to creatures like brachiopods, cephalopods, graptolites, and trilobites. Little is known about the state's Devonian and early Carboniferous life. Evidence indicates that during the late Carboniferous the state was home to marine life, land plants and early reptiles. During the Permian, the seas largely shrank away, but nevertheless coral reefs formed in the state. The rest of Texas was a coastal plain inhabited by early relatives of mammals like Dimetrodon and Edaphosaurus. During the Triassic, a great river system formed in the state that was inhabited by crocodile-like phytosaurs. Little is known about Jurassic Texas, but there are fossil aquatic invertebrates of this age like ammonites in the state. During the Early Cretaceous local large sauropods and theropods left a great abundance of footprints. Later in the Cretaceous, the state was covered by the Western Interior Seaway and home to creatures like mosasaurs, plesiosaurs, and few icthyosaurs. Early Cenozoic Texas still contained areas covered in seawater where invertebrates and sharks lived. On land the state would come to be home to creatures like glyptodonts, mammoths, mastodons, saber-toothed cats, giant ground sloths, titanotheres, uintatheres, and dire wolves. Archaeological evidence suggests that local Native Americans knew about local fossils. Formally trained scientists were already investigating the state's fossils by the late 1800s. In 1938, a major dinosaur footprint find occurred near Glen Rose. Pleurocoelus was the Texas state dinosaur from 1997 to 2009, when it was replaced by Paluxysaurus jonesi after the Texan fossils once referred to the former species were reclassified to a new genus.

Pope's Crossing was a ford on the Pecos River located one mile south of the New Mexico–Texas border on the modern Loving–Reeves county line. Discovered by members of an 1855 expedition tasked with drilling artesian wells east of the Pecos led by U.S. Army topographical engineer John Pope, the ford quickly became the primary crossing of the river on the "upper" military or emigrant road between San Antonio and the ford on the Rio Grande opposite the Mexican town of El Paso del Norte. Heavily used by emigrants, soldiers, traders, and freighters eager to avoid the more difficult and unpredictable crossings further south, Pope's Crossing became a well-traveled part of the network of transcontinental wagon roads that developed across Texas in the 1850s to facilitate settlement and commerce in the southwestern lands recently acquired as a result of the Mexican–American War.

References

  1. 1 2 "Texas' Natural Environment". Texas Almanac . Retrieved 2016-06-25.
  2. Nova Lomax, John (March 3, 2015). "Is Texas Southern, Western, or Truly a Lone Star?". Texas Monthly . Retrieved September 6, 2016.
  3. Cox, Mike (December 31, 2014) [November 4, 2004]. "New Geography: Remapping of the Lone Star State & Place Name Tweaking of Several Counties and County Seats". Texas Escapes.com. Texas Tales. Retrieved 2006-07-15.
  4. "Texas Almanac" . Retrieved 2021-04-01.
  5. "StateMaster" . Retrieved 2006-07-11.
  6. "Netstate" . Retrieved 2006-07-11.
  7. "About.com". Archived from the original on 2013-01-01. Retrieved 2006-07-11.
  8. "Tx Parks and Wildlife" . Retrieved 2006-07-14.
  9. "Tx Environmental Profiles". Archived from the original on 2008-06-03. Retrieved 2006-07-14.
  10. "Bays & Estuaries". Texas Water Development Board . Retrieved March 8, 2020.
  11. 1 2 3 4 "LoneStarInternet" . Retrieved 2006-07-14.
  12. 1 2 3 "Tx Environmental Profiles" . Retrieved 2006-07-14.
  13. "The Rolling Plains Region". Archived from the original on 2013-10-22. Retrieved 2013-08-20.
  14. "USDA Houston Black" (PDF). Retrieved 2006-07-14.[ permanent dead link ]
  15. "Tx Parks and Wildlife" . Retrieved 2006-07-14.
  16. "The Office of the State Climatologist". Archived from the original on 2006-07-06. Retrieved 2006-07-14.
  17. "Tx Almanac" . Retrieved 2018-07-03.
  18. "infoplease.com" . Retrieved 2006-07-14.
  19. Garner, L. Edwin. "The Handbook of Texas online" . Retrieved 2006-07-11.
  20. Jordan, Terry G. (1978). "Perceptual Regions in Texas". Geographical Review. 68 (3): 293–307. Bibcode:1978GeoRv..68..293J. doi:10.2307/215048. ISSN   0016-7428. JSTOR   215048.
  21. "Regional Reports (2022 Edition)". Comptroller.Texas.Gov. Retrieved April 18, 2023.
  22. Art Leatherwood, "LLANO ESTACADO," Handbook of Texas Online , accessed May 02, 2012. Published by the Texas State Historical Association.
  23. E. H. Johnson, "SOUTH TEXAS PLAINS," Handbook of Texas Online , accessed May 03, 2012. Published by the Texas State Historical Association.
  24. Terry G. Jordan, "HILL COUNTRY," Handbook of Texas Online , accessed May 01, 2012. Published by the Texas State Historical Association.