|U.S. Interior Highlands|
1:1000000 scale DEM of the U.S. Interior Highlands
| Mount Magazine |
2,753 ft (839 m)
The U.S. Interior Highlands is a mountainous region in the Central United States spanning northern and western Arkansas, southern Missouri, eastern Oklahoma, and extreme southeastern Kansas. The name is designated by the United States Geological Survey to refer to the combined subregions of the Ouachita Mountains and the Ozark Plateaus. The U.S. Interior Highlands is one of few mountainous regions between the Appalachians and Rockies.
In geography, regions are areas that are broadly divided by physical characteristics, human impact characteristics, and the interaction of humanity and the environment. Geographic regions and sub-regions are mostly described by their imprecisely defined, and sometimes transitory boundaries, except in human geography, where jurisdiction areas such as national borders are defined in law.
The Central United States is sometimes conceived as between the Eastern and Western United States as part of a three-region model, roughly coincident with the U.S. Census' definition of the Midwestern United States plus the western and central portions of the U.S. Census' definition of the Southern United States. The Central States are typically considered to consist of North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, Texas, Minnesota, Iowa, Missouri, Arkansas, Louisiana, Wisconsin, and Illinois. Sometimes Indiana, Ohio, Kentucky, Tennessee, West Virginia, Mississippi, and Alabama are also considered to be central states.
Arkansas is a state in the southern region of the United States, home to over 3 million people as of 2018. Its name is of Siouan derivation from the language of the Osage denoting their related kin, the Quapaw Indians. The state's diverse geography ranges from the mountainous regions of the Ozark and the Ouachita Mountains, which make up the U.S. Interior Highlands, to the densely forested land in the south known as the Arkansas Timberlands, to the eastern lowlands along the Mississippi River and the Arkansas Delta.
There are three distinct mountain ranges within the U.S. Interior Highlands:
The Ouachita Mountains, simply referred to as the Ouachitas, are a mountain range in western Arkansas and southeastern Oklahoma. They are formed by a thick succession of highly deformed Paleozoic strata constituting the Ouachita Fold and Thrust Belt, one of the important orogenic belts of North America. The Ouachitas continue in the subsurface to the southeast where they make a poorly understood connection with the Appalachians and to the southwest where they join with the Marathon area of West Texas. Together with the Ozark Plateaus, the Ouachitas form the U.S. Interior Highlands. The highest natural point is Mount Magazine at 2,753 feet.
The Arkansas River Valley is a region in Arkansas defined by the Arkansas River in the western part of the state. Generally defined as the area between the Ozark and Ouachita Mountains, the River Valley is characterized by flat lowlands covered in fertile farmland and lakes periodically interrupted by high peaks. Mount Magazine, Mount Nebo, and Petit Jean Mountain compose the Tri-Peaks Region, a further subdivision of the River Valley popular with hikers and outdoors enthusiasts. In addition to the outdoor recreational activities available to residents and visitors of the region, the River Valley contains Arkansas's wine country as well as hundreds of historical sites throughout the area.It is one of six natural divisions of Arkansas.
Mount Magazine, officially named Magazine Mountain, is the highest point of the U.S. Interior Highlands and the U.S. state of Arkansas, and is the site of Mount Magazine State Park. It is a flat-topped mountain or mesa capped by hard rock and rimmed by precipitous cliffs. There are two summits atop the mountain: Signal Hill, which reaches 2,753 feet (839 m), and Mossback Ridge, which reaches 2,700 ft (823.0 m).
The U.S. Interior Highlands is dominated by temperate broadleaf and mixed forests. Three national forests are located here: The Ouachita National Forest in Arkansas and Oklahoma; the Ozark-St. Francis National Forest in Arkansas; and the Mark Twain National Forest in Missouri.
Temperate broadleaf and mixed forest is a temperate climate terrestrial habitat type defined by the World Wide Fund for Nature, with broadleaf tree ecoregions, and with conifer and broadleaf tree mixed coniferous forest ecoregions.
National Forest is a classification of protected and managed federal lands in the United States. National Forests are largely forest and woodland areas owned collectively by the American people through the federal government, and managed by the United States Forest Service, a division of the United States Department of Agriculture.
The Ouachita National Forest is a National Forest that lies in the western portion of Arkansas and portions of eastern Oklahoma.
Missouri, a state near the geographical center of the United States, has three distinct physiographic divisions:
The Ozarks, also called the Ozark Mountains or Ozark Plateau, is a physiographic region in the U.S. states of Missouri, Arkansas, Oklahoma, and extreme southeastern Kansas. The Ozarks cover a significant portion of northern Arkansas and most of the southern half of Missouri, extending from Interstate 40 in Arkansas to the Interstate 70 in central Missouri.
The Boston Mountains is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma. Part of the Ozark Mountains, the Boston Mountains are a deeply dissected plateau. The ecoregion is steeper than the adjacent Springfield Plateau to the north, and bordered on the south by the Arkansas Valley. The Oklahoma portion of the range is locally referred to as the Cookson Hills.
The Ozark – St. Francis National Forest is a United States National Forest that is located in the state of Arkansas. It is composed of two separate forests, Ozark National Forest in the Ozark Mountains; and St. Francis National Forest on Crowley's Ridge. Each forest has distinct biological, topographical, and geological differences.
The St. Francois Mountains in southeast Missouri are a mountain range of Precambrian igneous mountains rising over the Ozark Plateau. This range is one of the oldest exposures of igneous rock in North America. The name of the range is spelled out as Saint Francois Mountains in official GNIS sources, but it is sometimes misspelled in use as St. Francis Mountains to match the anglicized pronunciation of both the range and St. Francois County.
The Gulf Coastal Plain extends around the Gulf of Mexico in the Southern United States and eastern Mexico.
Taum Sauk Mountain in the Saint Francois Mountains is the highest natural point in the U.S. state of Missouri at 1,772 feet . The topography of Taum Sauk is that of an elongated ridge with a NNW-SSE orientation rather than a peak.
The Ozarks is a highland region in the central United States.
Ouachita National Recreation Trail is a 223-mile (359 km) long, continuous hiking trail through the Ouachita Mountains of Oklahoma and Arkansas. It is the longest backpacking trail in the Ouachita National Forest, spanning 192 miles across its length. Approximately 177 miles of the trail is in Arkansas and 46 miles of the trail is in Oklahoma. The trail is used by hikers, backpackers, hunters, and mountain bikers. It is a non-motorized single track trail open only to foot traffic and partially open to mountain bicycles. Segments opened to mountain bikes are from the western terminus of the Ouachita Trail at Talimena State Park to the Big Cedar trailhead on US Highway 259 at approximately Mile Marker (MM) 30.5 in Oklahoma, and from the Talimena Scenic Drive Trailhead at MM 54.1, east to Highway 7 at mile 160.4, north of Jessieville, Arkansas.
The Ozark Mountain forests are a temperate broadleaf and mixed forests ecoregion of the central United States delineated by the World Wide Fund for Nature. The ecoregion covers an area of 23,900 square miles in northern Arkansas and eastern Oklahoma.
The Geography of Oklahoma encompasses terrain and ecosystems ranging from arid plains to subtropical forests and mountains. Oklahoma contains 10 distinct ecological regions, more per square mile than in any other state by a wide margin. It is situated in the Great Plains and U.S. Interior Highlands region near the geographical center of the 48 contiguous states. Usually considered part of the South Central United States, Oklahoma is bounded on the east by Arkansas and Missouri, on the north by Kansas, on the northwest by Colorado, on the far west by New Mexico, and on the south and near-west by Texas.
The geography of Arkansas varies widely. The state is covered by mountains, river valleys, forests, lakes, and bayous in addition to the cities of Arkansas. Hot Springs National Park features bubbling springs of hot water, formerly sought across the country for their healing properties. Crowley's Ridge is a geological anomaly rising above the surrounding lowlands of the Mississippi embayment.
The Ozark Highlands is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in four U.S. states. Most of the region is within Missouri, with a part in Arkansas and small sections in Oklahoma and Kansas. It is the largest subdivision of the region known as the Ozark Mountains, flatter in comparison to the Boston Mountains in Arkansas, the steepest part of the Ozarks.
Devil's Den State Park is a 2,500-acre (1,000 ha) Arkansas state park in Washington County, near West Fork, Arkansas in the United States. The park was built by the Civilian Conservation Corps, beginning in 1933. Devil's Den State Park is in the Lee Creek Valley in the Boston Mountains, which are the southwestern part of The Ozarks. The park, with an 8 acres (3.2 ha) CCC-built lake, is open for year-round recreation, with trails for hiking, mountain biking and horseback riding. Devil's Den State Park also has several picnic areas, a swimming pool and cabins, with camping sites ranging from modern to primitive. Fossils of coral and crinoids can be found along the banks and within Lee Creek at Devil's Den State Park.
The Arkansas Valley is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma. It parallels the Arkansas River between the flat plains of western Oklahoma and the Arkansas Delta, dividing the Ozarks and the Ouachita Mountains with the broad valleys created by the river's floodplain, occasionally interrupted by low hills, scattered ridges, and mountains. In Arkansas, the region is often known as the Arkansas River Valley, especially when describing the history and culture of the region.