'', Felsenthal NWR Ashley County is split between two geographic regions, divided by the
Bayou Bartholomew. The rich, fertile, alluvial soils of the
Mississippi Alluvial Plain extend into the eastern part of the county. In Arkansas, this region is called the Arkansas Delta (in Arkansas, usually referred to as "the Delta"), having a distinct history and culture from adjacent regions. West of the Ouachita, Ashley County is characterized by forests of
shortleaf pine and
hardwoods typical of the
Gulf Coastal Plain. In Arkansas, this region is referred to as the
Arkansas Timberlands, a subdivision of the
Piney Woods. According to the
U.S. Census Bureau, the county has a total area of , of which is land and (1.6%) is water. The
lowest point in the state of Arkansas is located on the
Ouachita River in Ashley County and
Union County, where it flows out of Arkansas and into
Louisiana. The county is located approximately north of
Monroe, Louisiana, south of
Little Rock, and northwest of
Jackson, Mississippi.{{#tag:ref|Mileages from Ashley County to Monroe, Little Rock, and Jackson are based on highway miles using county seat Hamburg for Ashley County.
Adjacent counties •
Drew County - north •
Chicot County - east •
Morehouse Parish, Louisiana - south •
Union Parish, Louisiana - southwest •
Union County - west •
Bradley County - northwest
Hydrology Water is an extremely important part of Ashley County's geography, history, economy, and culture. The many rivers, streams, and ditches crossing the county have featured prominently since prehistoric times, and many archaeological sites, including the Lake Enterprise Mound from the
Archaic period, are along waterways. Many early white settlements, including
Berea, Arkansas, were founded along waterways, but many faded as railroads eclipsed waterways as the favored mode of transportation. Ashley County is split among four watersheds: the lower
Saline River in the northwest, lower
Ouachita River in the southwest,
Bayou Bartholomew across the majority of the county, and the
Boeuf River along the eastern edge. The Saline River serves as the northwestern boundary of the county before emptying into the
Ouachita River, which serves as the southwestern boundary. The
Port of Crossett is positioned just south of the Saline River's mouth. Within the county, Bearhouse Creek, Chemin-a-haut Bayou, Fountain Creek, Flat Creek, Mill Creek, and Overflow Creek are important watercourses.
Protected areas Ashley County contains
Overflow National Wildlife Refuge, part of the
Felsenthal National Wildlife Refuge, and four
Wildlife Management Areas (WMAs) under
Arkansas Game and Fish Commission jurisdiction. Beryl Anthony Lower Ouachita WMA preserves seasonally flooded
bottomland hardwood forest habitat along the Ouachita River between the Felsenthal NWR and the Louisiana state line for preservation, recreation, and hunting opportunities. Duck hunting, especially when the Ouachita River floods, is the primary hunting opportunity due to the site's position along the
Mississippi Flyway, with deer and squirrel hunting also available during the year. Most of the is on the Union County side of the Ouachita River, leaving the only public access to the Ashley County area via boat. A small segment in Ashley County contains the Coffee Prairie Natural Area, owned by the
Arkansas Natural Heritage Commission. This lease includes segments of working forest actively managed for forest products, primarily by single tree selection. Habitats range from upland pine to bottomland hardwood depending upon location. Deer and turkey hunting are most common in the WMA. Little Bayou WMA is located in northeastern Ashley County along the western banks of Bayou Bartholomew at the mouth of Little Bayou. The area contains a boat ramp on Bayou Bartholomew, as well as
birding, camping, fishing, and hunting. The former agricultural area was replanted with bottomland and upland hardwoods, short-leaf pines, and native warm season grasses in the 1990s. , now listed on the
NRHP The
Crossett Experimental Forest is a property donated by
Georgia-Pacific Corporation in 1934 to research forest management in second-growth
loblolly pine and shortleaf pine forests. Within the Forest is the Reynolds Natural Area, a stand that has been largely untouched since the area's creation in 1934. The property is managed by the
Southern Research Station of the
United States Forest Service. ==Demographics==