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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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| Cockaponset State Forest | State Forest | 3 | Killingworth | Connecticut |
| Haddam Island State Park | State Park | 3.4 | Haddam | Connecticut |
| Gillette Castle State Park | State Park | 3.5 | East Haddam | Connecticut |
| George Dudley Seymour State Park | State Park | 5.1 | Haddam | Connecticut |
| Higganum Reservoir State Park | State Park | 5.4 | Higganum | Connecticut |
| Selden Neck State Park | State Park | 5.4 | Lyme | Connecticut |
| Hurd State Park | State Park | 5.6 | East Hampton | Connecticut |
| Devils Hopyard State Park | State Park | 6.4 | East Haddam | Connecticut |
| Haddam Meadows State Park | State Park | 7.5 | Haddam | Connecticut |
| Dart Island State Park | State Park | 7.9 | Middletown | Connecticut |