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.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.
The largest city in the state's eastern part is Jonesboro.
The largest city in the state's southeastern part is Pine Bluff.
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".
Farther away from the river, in the southeast portion of the state, the Grand Prairie consists of a more undulating landscape. The Delta region is bisected by a geological formation known as Crowley's Ridge.
A narrow band of rolling hills, Crowley's Ridge rises from 250 to 500 feet (76 to 152 m) above the surrounding alluvial plain and underlies many of the major towns of eastern Arkansas.
The Mississippi River forms most of Arkansas's eastern border, except in Clay and Greene, counties where the St.
Francis River forms the western boundary of the Missouri Bootheel, and in many places where the channel of the Mississippi has meandered (or been straightened by man) from its original 1836 course.
The state's diverse geography ranges from the mountainous regions of the Ozark and the Ouachita Mountains, which make up the U. 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.
Arkansas is the 29th largest by area and the 33rd most populous of the 50 United States.
The southeastern part of Arkansas along the Mississippi Alluvial Plain is sometimes called the Arkansas Delta.