The southeastern part of Arkansas along the Mississippi Alluvial Plain is sometimes called the Arkansas Delta.
This region is a flat landscape of rich alluvial soils formed by repeated flooding of the adjacent Mississippi.
Arkansas can generally be split into two halves, the highlands in the northwest half and the lowlands of the southeastern half.
These directionally named regions are broad and not defined along county lines.
Arkansas has seven distinct natural regions: the Ozark Mountains, Ouachita Mountains, Arkansas River Valley, Gulf Coastal Plain, Crowley's Ridge, and the Arkansas Delta, with Central Arkansas sometimes included as a blend of multiple regions.
Northwest Arkansas is part of the Ozark Plateau including the Ozark Mountains, to the south are the Ouachita Mountains, and these regions are divided by the Arkansas River; the southern and eastern parts of Arkansas are called the Lowlands.
The Arkansas is fed by the Mulberry River and the Fourche La Fave River in the Arkansas River Valley, which is also home to Lake Dardanelle.
The Kansa tribe of Native Americans are closely associated with the Sioux tribes of the Great Plains.
The word "Arkansas" itself is a French pronunciation ("Arcansas") of a Quapaw (a related "Kaw" tribe) word, akakaze, meaning "land of downriver people" or the Sioux word akakaze meaning "people of the south wind".
More than 43,000 Native American living, hunting and tool making sites, many of them Pre-Columbian burial mounds and rock shelters, have been cataloged by the State Archeologist.
Crater of Diamonds State Park near Murfreesboro is the world's only diamond-bearing site accessible to the public for digging.
The Territory of Arkansas was admitted to the Union as the 25th state on June 15, 1836.
In 1861 Arkansas withdrew from the United States and joined the Confederate States of America during the Civil War.
On returning to the Union in 1868, the state continued to suffer due to its earlier reliance on slavery and the plantation economy, causing the state to fall behind economically and socially.