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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 | 14.8 | St. Marys | Ohio |
| Harbor Point State Park | State Park | 17.1 | Celina | Ohio |
| Lake Loramie State Park | State Park | 21.8 | Minster | Ohio |
| Indian Lake State Park | State Park | 22.3 | Lakeview | Ohio |
| Fox Island State Park | State Park | 24.9 | Washington | Ohio |
| Indian Lake Wildlife Area | State Wildlife Area | 25.1 | Russells Point | Ohio |
| Limberlost State Memorial | State Memorial | 37 | Geneva | Indiana |
| Kiser Lake State Park | State Park | 38.3 | St. Paris | Ohio |
| Independence Dam State Park | State Park | 41.9 | Defiance | Ohio |
| Treaty Of Greenville State Park | State Park | 44.1 | Greenville | Ohio |