Arkansas Level 4 Ecoregions Map
| er35a - Tertiary Uplands |
| er35b - Floodplains and Low Terraces |
| er35c - Pleistocene Fluvial Terraces |
| er35d - Cretaceous Dissected Uplands |
| er35g - Red River Bottomlands |
| er35h - Blackland Prairie |
| er36a - Athens Plateau |
| er36b - Central Mountain Ranges |
| er36c - Central Hills, Ridges, and Valleys |
| er36d - Fourche Mountains |
| er36e - Western Ouachitas |
| er37a - Scattered High Ridges and Mountains |
| er37b - Arkansas River Floodplain |
| er37c - Arkansas Valley Hills |
| er37d - Arkansas Valley Plains |
| er38a - Upper Boston Mountains |
| er38b - Lower Boston Mountains |
| er39a - Springfield Plateau |
| er39b - Dissected Springfield Plateau-Elk River Hills |
| er39c - White River Hills | er39c - Central Plateau |
| er39j - Black River Hills Border | er39j - Northern Holocene Meander Belts |
| er73b - Northern Pleistocene Valley Trains | er73b - St. Francis Lowlands |
| er73d - Northern Backswamps | er73d - Grand Prairie |
| er73f - Western Lowlands Holocene Meander Belts | er73f - Western Lowlands Pleistocene Valley Trains |
| er73h - Arkansas/Ouachita River Holocene Meander Belts | er73h - Arkansas/Ouachita River Backswamps |
| er73j - Macon Ridge | er73j - Bluff Hills |
Based on Ecoregions developed by the EPA this map describe areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources, as well as similarity of climate that can assist Arkansas gardenders.
