There are 5 National Natural Landmarks in Arkansas. Four are forests and one is a spring.
| Name | Image | Date | Location | County | Ownership | Description |
|---|---|---|---|---|---|---|
| Federal | Forest area within Big Lake National Wildlife Refuge. | |||||
| Federal | Pine forest near Lake Winona (Arkansas); part of Ouachita National Forest. | |||||
| 36.4978°N -91.5359°W | State | The largest first magnitude spring in Arkansas, it is connected underground to the Grand Gulf State Park in Missouri. | ||||
| Federal | Steep ravine with a virgin forest in Ouachita National Forest. | |||||
| Federal | Virgin hardwood bottomland forest in White River National Wildlife Refuge. | |||||