Legislated Wilderness Areas in the United States
These are designated wilderness areas through Congressional legislation. They do not include national parks or monuments, though many are associated with or near National Parks. Much more land can be considered wilderness as well, but may not be protected to the extent of these shown here.
This map was created by calling an ArcGIS for Server REST API from the National Park Service's data portal. Additional symbolysm was applied through colors and custom popup boxes showing names and establishment dates. The data did not have uniform sizes for each wilderness area, thus they were excluded from the popup information.