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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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| Grand Lake State Park | State Park | 13.2 | St. Marys | Ohio |
| Harbor Point State Park | State Park | 15.8 | Celina | Ohio |
| Fort Amanda State Park | State Park | 21.8 | Lima | Ohio |
| Kiser Lake State Park | State Park | 23.8 | St. Paris | Ohio |
| Treaty Of Greenville State Park | State Park | 24.1 | Greenville | Ohio |
| Indian Lake Wildlife Area | State Wildlife Area | 24.4 | Russells Point | Ohio |
| Indian Lake State Park | State Park | 24.6 | Lakeview | Ohio |
| Fox Island State Park | State Park | 24.8 | Washington | Ohio |
| Fort Jefferson State Memorial | State Memorial | 29.4 | Greenville | Ohio |
| Cedar Bog State Nature Preserve | State Nature Preserve | 35.7 | Urbana | Ohio |