From List of National Natural Landmarks, these are the National Natural Landmarks in Arkansas. There are 5 in total, 4 are forests, 1 is other (spring).
| Name | Image | Date | Location | County | Description | |
|---|---|---|---|---|---|---|
| 1 | Big Lake Natural Area | 1974 | Mississippi | Forest area within Big Lake National Wildlife Refuge.[1] | ||
| 2 | Lake Winona Research Natural Area | 1976 | Saline | Pine forest near Lake Winona, water supply lake on Alum Fork of Saline River.[2][3] | ||
| 3 | Mammoth Spring | June 1972 | Mammoth Spring | Fulton | The largest first magnitude spring in Arkansas, it is connected underground to another Natural Landmark, the Grand Gulf State Park in Missouri. | |
| 4 | Roaring Branch Research Natural Area | 1976 | Polk | [4] | ||
| 5 | White River Sugarberry Natural Area | 1974 | Desha | [5] |
|
||||||||