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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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| Ouabache State Park | State Park | 13 | Bluffton | Indiana |
| Harbor Point State Park | State Park | 22.7 | Celina | Ohio |
| Grand Lake State Park | State Park | 26.2 | St. Marys | Ohio |
| Lake Loramie State Park | State Park | 36.4 | Minster | Ohio |
| Fort Amanda State Park | State Park | 37 | Lima | Ohio |
| Treaty Of Greenville State Park | State Park | 37.4 | Greenville | Ohio |
| Salamonie River State Forest | State Forest | 41.6 | Lagro | Indiana |
| Fort Jefferson State Memorial | State Memorial | 42.1 | Greenville | Ohio |
| Summit Lake State Park | State Park | 43.3 | New Castle | Indiana |
| Mounds State Park | State Park | 48.3 | Anderson | Indiana |