From List of National Natural Landmarks, these are the National Natural Landmarks in Pennsylvania. There are 27 in total.
{{clear}} | Name | Image | Date | Location | County | Ownership | Description | | 1 | Bear Meadows Natural Area | 1965 | {{coord>40.406111|-77.173889|type:landmark|name=Bear Meadows Natural Area}} | Centre | public/state
Rothrock State Forest |
| 2 | Box Huckleberry Site | 1967|4}} | {{coord>40.406111|-77.173889|type:landmark|name=Box Huckleberry Site}} | Perry | public/state
Tuscarora State Forest | 10|acre|ha|adj=on}} natural area which preserves a rare colony of box huckleberry over 1,000 years old. |
| 3 | Cook Forest State Park | 1967|11}} | {{coord>41.323611|-79.163889|name=Cook Forest|type:landmark}} | Clarion
Forest
Jefferson | public/state | 8500|acre|0|adj=on}} state park notable for its spectacular stands of old-growth Eastern White Pine and Eastern Hemlock, many from around 1644. |
| 4 | Ferncliff Peninsula Natural Area | 1973 | {{coord>39.867555|-79.498229|type:landmark|name=Ferncliff Peninsula Natural Area}} | Fayette | public/state
Ohiopyle State Park | 100|acre|0|adj=on}} peninsula is formed by a meander in the Youghiogheny River. It is a good example of a late successional forests in the Allegheny Mountains |
| 6 | Florence Jones Reineman Wildlife Sanctuary | 1973 | {{coord>40|16|0|N|77|16|0|W|name=Florence Jones Reineman Wildlife Sanctuary|type:landmark}} | Cumberland
Perry | private/family trust | 3100|acre|0|adj=on}} diverse ecological community. |
| 7 | Pine Creek Gorge | 1968 | {{coord>41.271667|-77.326944|type:landmark|name=Pine Creek Gorge}} | Tioga
Lycoming | public/state
Tioga State Forest | 160000|acre|0}}. |
| 8 | Hawk Mountain Sanctuary | 1965 | {{coord>40.645556|-75.98|name=Hawk Mountain|type:landmark}} | Berks | private/nonprofit | A sanctuary on an Appalachian ridge, known as an excellent vantage point for hawk migrations. |
| 9 | Hearts Content Scenic Area | 1973[1] or 1977[2] | {{coord>41.691|-79.254|name=Hearts Content National Scenic Area|type:landmark}} | Warren | public/federal
Allegheny National Forest | 120|acre|0}}. |
| 10 | Hemlocks Natural Area | 1972 | {{coord>40.238418|-77.641379|name=Hemlocks Natural Area|type:landmark}} | Perry | public/state
Tuscarora State Forest | Features numerous old growth hemlock trees. |
| 11 | Hickory Run Boulder Field | 1967 | {{coord>41.036111|-75.683889|name=Hickory Run State Park|type:landmark}} | Carbon | public/state
Hickory Run State Park | 16.5|acre|0|adj=on}} landscape of sandstone boulders, which were formed approximately 20,000 years ago. |
| 12 | Lake Lacawac | 1968 | {{coord>41.382289|-75.292078|name=Lake Lacawac|type:landmark}} | Wayne | private/nonprofit | 52|acre|0|adj=on}} glacial lake surrounded by a hardwood conifer forest. |
| 13 | McConnells Mill State Park | 1972 | {{coord>40.926667|-80.19|name=McConnells Mill State Park|type:landmark}} | Lawrence | public/state | 2546|acre|0}} of the Slippery Rock Creek gorge, including several waterfalls. |
| 14 | Monroe Border Fault | 1980 | {{coord>40.579756|-75.197556|name=Monroe Border Fault|type:landmark}} | Bucks | public/state
Nockamixon State Park | An upland along the Delaware River, the area features a variety of exposed rocks from different geological ages. |
| 15 | Nay Aug Park Gorge and Waterfall | 1989 | {{coord>41.401389|-75.642778|name=Nay Aug Park Gorge and Waterfall|type:landmark}} | Lackawanna | public/municipal | Located in an urban park, it features a rock-strewn, heavily wooded gorge. |
| 16 | Nottingham Park Serpentine Barrens | 2009 | {{coord>39.740507|-76.039112|type:landmark|name=Nottingham County Park}} | Chester | private/nonprofit | 651|acre|0|adj=on}} county park on one of the largest outcrops of serpentine in the eastern US, which creates a savanna-like habitat with a number of unusual flora. |
| 17 | Presque Isle State Park | 1967 | {{coord>42.163056|-80.100833|name=Presque Isle State Park|type:landmark}} | Erie | public/state | 3112|acre|0|adj=on}} sandy peninsula stretching into Lake Erie. |
| 18 | Reynolds Spring and Algerine Swamp Bogs | 1974 | {{coord>41.550902|-77.497481|name=Reynolds Spring and Algerine Swamp Bogs|type:landmark}} | Tioga
Lycoming | public/state
Tioga State Forest | 1302|acre|0}} and {{convert|84|acre|0}}, which are surrounded by thick oak and pine groves. |
| 19 | The Glens Natural Area | 1968 | {{coord>41|19|34|N|76|16|46|W|name=Ricketts Glen State Park|type:landmark}} | Columbia
Sullivan
Luzerne | public/state
Ricketts Glen State Park | 2845|acre|0}} of old growth forest, with many trees exceed {{convert|100|ft|m}} in height. Twenty two separate named waterfalls are located in the area. |
| 20 | Snyder Middleswarth Natural Area | 1967 | {{coord>40.81|-77.283056|name=Snyder Middleswarth Natural Area|type:landmark}} | Snyder | public/state
Bald Eagle State Forest | 500|acre|0}}. |
| 21 | Susquehanna Water Gaps | 1968 | {{coord>40.520918|-76.978867|name=Susquehanna Water Gaps|type:landmark}} | Cumberland, Dauphin, Perry | public/state | Millions of years of erosive rock create impressive landforms of unique geologic heritage and outstanding natural beauty, as the Susquehanna River cuts through five ridges of the Appalachian Mountains north of Harrisburg. |
| 22 | Tamarack Swamp | 1977 | {{coord>41.989|-79.555|name=Tamarack Swamp|type:landmark}} | Warren | public/state | An acidic kettle pond bog. |
| 23 | Tannersville Cranberry Bog | 1974 | {{coord>41|2|24|N|75|18|21.6|W|name=Tannersville Cranberry Bog|type:landmark}} | Monroe | private/nonprofit | 1000|acre|0|adj=on}} kettle lake fen. |
| 24 | John Heinz National Wildlife Refuge at Tinicum | 1965 | {{coord>39.885866|-75.262356|name=John Heinz National Wildlife Refuge at Tinicum|type:landmark}} | Philadelphia
Delaware | public/federal | 350|acre|0}} located in an urban environment. |
| 25 | Tionesta Scenic and Research Natural Areas | 1973 | {{coord>41.645|-78.941|name=Tionesta Scenic and Research Natural Areas|type:landmark}} | Warren
McKean | public/federal
Allegheny National Forest | 4131|acre|0}} of old growth forest on the Allegheny Plateau. |
| 26 | Titus and Wattsburg Bogs | 1977 | {{coord>41.943388|-79.763107|name=Titus and Wattsburg Bogs|type:landmark}} | Erie | private/nonprofit | 125|acre|0}} located near the shore of Lake Erie. |
| 27 | Wissahickon Valley | 1964 | {{coord>40.016056|-75.205744|name=Wissahickon Valley|type:landmark}} | Montgomery, Philadelphia | public/state
Fort Washington State Park | Protects an urbanized tributary of the Schuylkill River, which features a gorge and thick woodlands. |
|
1. ^{{cite web|title=Hearts Content Scenic Area|publisher=National Park Service|url=http://www.nature.nps.gov/nnl/Registry/USA_Map/States/Pennsylvania/NNL/HC/index.cfm|accessdate=2009-12-12}}
2. ^{{cite web|title=Hearts Content Recreation Area|publisher=United States Forest Service|date=2007-04-14|url=http://www.fs.fed.us/r9/forests/allegheny/recreation/camping/heartscontent|accessdate=2008-01-15}}
{{Pennsylvania|collapsed}}{{NatNaturalLand}}