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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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| Richland Furnace State Forest | State Forest | 14.1 | Washington | Ohio |
| Buckeye Furnace State Memorial | State Memorial | 16.6 | Wellston | Ohio |
| Leo Petroglyph State Memorial | State Memorial | 18.5 | Ray | Ohio |
| Sunday Creek Wildlife Area | State Wildlife Area | 19.8 | New Straitsville | Ohio |