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There are 27 National Natural Landmarks in Pennsylvania.

Name	Image	Date	Location	County	Ownership	Description
Bear Meadows Natural Area		1965	40°24′22″N 77°10′26″W / 40.406111°N 77.173889°W / 40.406111; -77.173889 (Bear Meadows Natural Area)	Centre	public/state Rothrock State Forest
Box Huckleberry Site		April 1967	40°24′22″N 77°10′26″W / 40.406111°N 77.173889°W / 40.406111; -77.173889 (Box Huckleberry Site)	Perry	public/state Tuscarora State Forest	A 10-acre (4.0 ha) natural area which preserves a rare colony of box huckleberry over 1,000 years old.
Cook Forest State Park		November 1967	41°19′25″N 79°09′50″W / 41.323611°N 79.163889°W / 41.323611; -79.163889 (Cook Forest)	Clarion Forest Jefferson	public/state	A 8,500-acre (3,440 ha) 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	39°52′03″N 79°29′54″W / 39.867555°N 79.498229°W / 39.867555; -79.498229 (Ferncliff Peninsula Natural Area)	Fayette	public/state Ohiopyle State Park	This 100-acre (40 ha) peninsula is formed by a meander in the Youghiogheny River. It is a good example of a late successional forests in the Allegheny Mountains
Ferncliff Wildflower and Wildlife Preserve		1972	39°46′57″N 76°14′34″W / 39.78259°N 76.24274°W / 39.78259; -76.24274	Lancaster	private/nonprofit	The vegetation within the Ferncliff Wildflower and Wildlife Preserve is an excellent example of a mixed mesophytic forest that occupies the valleys and ravines of the oak-chestnut forest region.
Florence Jones Reineman Wildlife Sanctuary		1973	40°16′0″N 77°16′0″W / 40.26667°N 77.26667°W / 40.26667; -77.26667	Cumberland Perry	private/family trust	Contains a 3,100-acre (1,255 ha) diverse ecological community.
Pine Creek Gorge		1968	41°16′18″N 77°19′37″W / 41.271667°N 77.326944°W / 41.271667; -77.326944 (Pine Creek Gorge)	Tioga Lycoming	public/state Tioga State Forest	Known as the "Grand Canyon of Pennsylvania", a deep gorge carved by glacial meltwater. The maximum depth of the canyon is 1,450 feet (442 m) at Waterville, near the southern end. At Leonard Harrison and Colton Point State Parks, the depth is more than 800 feet and from rim to rim is approximately 4,000 feet (1200 m). Protects 160,000 acres (64,750 ha).
Hawk Mountain Sanctuary		1965	40°38′27″N 75°59′32″W / 40.640833°N 75.992222°W / 40.640833; -75.992222 (Hawk Mountain Sanctuary)	Berks Schuylkill	private/nonprofit	A sanctuary on a Blue Mountain ridge, known as an excellent vantage point for hawk migrations.
Hearts Content Scenic Area		1973^[1] or 1977^[2]	41°41′28″N 79°15′14″W / 41.691°N 79.254°W / 41.691; -79.254	Warren	public/federal Allegheny National Forest	An old-growth white pine forest of 120 acres (49 ha).
Hemlocks Natural Area		1972	40°14′18″N 77°38′29″W / 40.238418°N 77.641379°W / 40.238418; -77.641379 (Hemlocks Natural Area)	Perry	public/state Tuscarora State Forest	Features numerous old growth hemlock trees.
Hickory Run Boulder Field		1967	41°02′10″N 75°41′02″W / 41.036111°N 75.683889°W / 41.036111; -75.683889 (Hickory Run State Park)	Carbon	public/state Hickory Run State Park	A 16.5-acre (7 ha) landscape of sandstone boulders, which were formed approximately 20,000 years ago.
Lake Lacawac		1968	41°22′56″N 75°17′31″W / 41.382289°N 75.292078°W / 41.382289; -75.292078 (Lake Lacawac)	Wayne	private/nonprofit	A 52-acre (21 ha) glacial lake surrounded by a hardwood conifer forest.
McConnells Mill State Park		1972	40°55′36″N 80°11′24″W / 40.926667°N 80.19°W / 40.926667; -80.19 (McConnells Mill State Park)	Lawrence	public/state	Protects 2,546 acres (1,030 ha) of the Slippery Rock Creek gorge, including several waterfalls.
Monroe Border Fault		1980	40°34′47″N 75°11′51″W / 40.579756°N 75.197556°W / 40.579756; -75.197556 (Monroe Border Fault)	Bucks	public/state Nockamixon State Park	An upland along the Delaware River, the area features a variety of exposed rocks from different geological ages.
Nay Aug Park Gorge and Waterfall		1989	41°24′05″N 75°38′34″W / 41.401389°N 75.642778°W / 41.401389; -75.642778 (Nay Aug Park Gorge and Waterfall)	Lackawanna	public/municipal	Located in an urban park, it features a rock-strewn, heavily wooded gorge.
Nottingham Park Serpentine Barrens		2009	39°44′26″N 76°02′21″W / 39.740507°N 76.039112°W / 39.740507; -76.039112 (Nottingham County Park)	Chester	private/nonprofit	A 651-acre (263 ha) 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.
Presque Isle State Park		1967	42°09′47″N 80°06′03″W / 42.163056°N 80.100833°W / 42.163056; -80.100833 (Presque Isle State Park)	Erie	public/state	A 3,112-acre (1,259 ha) sandy peninsula stretching into Lake Erie.
Reynolds Spring and Algerine Swamp Bogs		1974	41°33′03″N 77°29′51″W / 41.550902°N 77.497481°W / 41.550902; -77.497481	Tioga Lycoming	public/state Tioga State Forest	Contains two bogs of 1,302 acres (527 ha) and 84 acres (34 ha), which are surrounded by thick oak and pine groves.
The Glens Natural Area		1968	41°19′34″N 76°16′46″W / 41.32611°N 76.27944°W / 41.32611; -76.27944 (Ricketts Glen State Park)	Columbia Sullivan Luzerne	public/state Ricketts Glen State Park	2,845 acres (1,151 ha) of old growth forest, with many trees exceed 100 feet (30 m) in height. Twenty two separate named waterfalls are located in the area.
Snyder Middleswarth Natural Area		1967	40°48′36″N 77°16′59″W / 40.81°N 77.283056°W / 40.81; -77.283056 (Snyder Middleswarth Natural Area)	Snyder	public/state Bald Eagle State Forest	A hemlock, pine, and oak forest located on 500 acres (202 ha).
Susquehanna Water Gaps		1968	40°31′15″N 76°58′44″W / 40.520918°N 76.978867°W / 40.520918; -76.978867 (Susquehanna Water Gaps)	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.
Tamarack Swamp		1977	41°59′20″N 79°33′18″W / 41.989°N 79.555°W / 41.989; -79.555 (Tamarack Swamp)	Warren	public/state	An acidic kettle pond bog.
Tannersville Cranberry Bog		1974	41°2′24″N 75°18′21.6″W / 41.04000°N 75.306000°W / 41.04000; -75.306000 (Tannersville Cranberry Bog)	Monroe	private/nonprofit	A 1,000-acre (405 ha) kettle lake fen.
John Heinz National Wildlife Refuge at Tinicum		1965	39°53′09″N 75°15′44″W / 39.885866°N 75.262356°W / 39.885866; -75.262356	Philadelphia Delaware	public/federal	Protects a tidal marsh of 350 acres (142 ha) located in an urban environment.
Tionesta Scenic and Research Natural Areas		1973	41°38′42″N 78°56′28″W / 41.645°N 78.941°W / 41.645; -78.941	Warren McKean	public/federal Allegheny National Forest	4,131 acres (1,672 ha) of old growth forest on the Allegheny Plateau.
Titus and Wattsburg Bogs		1977	41°56′36″N 79°45′47″W / 41.943388°N 79.763107°W / 41.943388; -79.763107 (Titus and Wattsburg Bogs)	Erie	private/nonprofit	A peatland of 125 acres (51 ha) located near the shore of Lake Erie.
Wissahickon Valley		1964	40°00′58″N 75°12′21″W / 40.016056°N 75.205744°W / 40.016056; -75.205744 (Wissahickon Valley)	Montgomery, Philadelphia	public/state Fort Washington State Park	Protects an urbanized tributary of the Schuylkill River, which features a gorge and thick woodlands.