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| Lighthouse |
| Metro and City Park |
| National Forest |
| National Historic Landmark |
| National Historic Site |
| National Historical Park |
| National Memorial |
| National Park |
| National Recreation Area |
| National Seashore |
| National Wildlife Area |
| National Wildlife Refuge |
| State Fish Hatchery |
| State Fishery Area |
| State Forest |
| State Historic Site |
| State Memorial |
| State Natural Area |
| State Nature Preserve |
| State Nursery |
| State Park |
| State Preserve |
| State Recreation Area |
| State Reserve |
| State Wildlife Area |
| State Wildlife Management Area |
| State Wildlife Refuge |
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| Palmer State Park | State Park | 6 | Dublin | Maryland |
| Deer Creek State Park | State Park | 8.1 | Forest Hill | Maryland |
| Susquehanna National Wildlife Refuge | National Wildlife Refuge | 8.8 | Cambridge | Maryland |
| Elk Neck State Park | State Park | 13.2 | North East | Maryland |
| Elk Neck State Forest | State Forest | 14 | North East | Maryland |
| Susquehannock State Park | State Park | 15.6 | Drumore | Pennsylvania |
| Gunpowder State Park | State Park | 18.4 | Baldwin | Maryland |
| Fair Hill State Natural Resources Mgmt Area | State Park | 18.6 | Elkton | Maryland |
| White Clay Creek State Park | State Park | 22.2 | Newark | Delaware |
| Lums Pond State Park | State Park | 24.7 | Bear | Delaware |