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(Compare to map of Level IV ecoregions.) This list of ecoregions in Arkansas provides an overview of ecoregions in the U.S. state of Arkansas designated by the U.S. Environmental Protection Agency (EPA) and the Commission for Environmental Cooperation (CEC).
The Arkansas Department of Environmental Quality (ADEQ) describes Arkansas's water resources by using six ecoregions. Of the six, the Boston Mountain, Ouachita Mountain and Ozark Highlands ecoregions generally contain waterways with "exceptionally high quality water", including many of the state's extraordinary resources waters (ERWs).
The Arkansas–White–Red water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the ...
A rural Ozarks scene. Phelps County, Missouri The Saint Francois Mountains, viewed here from Knob Lick Mountain, are the exposed geologic core of the Ozarks.. The Ozarks, also known as the Ozark Mountains, Ozark Highlands or Ozark Plateau, is a physiographic region in the U.S. states of Missouri, Arkansas, and Oklahoma, as well as a small area in the southeastern corner of Kansas. [1]
The Arkansas River Valley, also known as the Arkansas 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, [1] the River Valley is characterized by flat lowlands covered in fertile farmland and lakes periodically interrupted by high peaks.
Arkansas (/ ˈ ɑːr k ən s ɔː / ⓘ AR-kən-saw [c]) is a landlocked state in the West South Central region of the Southern United States. [9] [10] It borders Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, Texas to the southwest, and Oklahoma to the west.
The location of the state of Arkansas in the United States of America. The following outline is provided as an overview of and topical guide to the U.S. state of Arkansas: Arkansas – state located in the southern region of the United States. It is a land of mountains and valleys, thick forests and fertile plains.
The following is a list of dams and reservoirs in Arkansas. All major dams are linked below. The National Inventory of Dams defines any "major dam" as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m 3 ), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m 3 ).