| Natural area name | State forest | County | Area | Date founded | Remarks |
|---|
| Alan Seeger Natural Area | Rothrock | Huntingdon | 390 acres (158 ha) | 1921 | Named after thepoet who died during World War I. Includes old growth forest remnants.[3][4] |
| Algerine Swamp Natural Area | Tiadaghton | Lycoming,Tioga | 84 acres (34 ha) | | Includes a glacial bog.[5][6] |
| Anders Run Natural Area | Cornplanter | Warren | 96 acres (39 ha) | 1987 | Includes a stone house built in 1841.[7][8] |
| Bark Cabin Natural Area | Tiadaghton | Lycoming | 7 acres (3 ha) | | Traversed by theMid State Trail; features old growth hemlocks.[6][9] |
| Bear Meadows Natural Area | Rothrock | Centre | 890 acres (360 ha) | 1965 | Also aNational Natural Landmark.[3][10] |
| Bear Run Natural Area | Bald Eagle | Centre | 32 acres (13 ha) | | [11][12] |
| Beartown Woods Natural Area | Michaux | Franklin | 27 acres (11 ha) | | Accessible via theAppalachian Trail.[13][14] |
| Big Flat Laurel Natural Area | Rothrock | Centre,Huntingdon | 184 acres (74 ha) | | [3][15] |
| Black Ash Swamp Natural Area | Tioga | Tioga | 308 acres (125 ha) | | [16][17] |
| Bruce Lake Natural Area | Delaware | Pike | 2,845 acres (1,151 ha) | | Includes both a natural glacial lake and a man-made lake.[18][19] |
| Buckhorn Natural Area | Delaware | Pike | 535 acres (217 ha) | | Also a designated Reptile and Amphibian Protection Area.[18][20] |
| Carbaugh Run Natural Area | Michaux | Adams | 780 acres (316 ha) | | Also a designated Reptile and Amphibian Protection Area, and founded to protect Native American archeological sites.[13][21] |
| Charles F. Lewis Natural Area | Gallitzin | Indiana | 384 acres (155 ha) | | Named after an area journalist and conservationist.[22][23] |
| Cranberry Swamp Natural Area | Sproul | Clinton | 144 acres (58 ha) | | Encompasses aboreal swamp.[24][25] |
| David R. Johnson Natural Area | William Penn | Bucks | 56 acres (23 ha) | | Named for its former landowner.[26][27] |
| Detweiler Run Natural Area | Rothrock | Huntingdon | 463 acres (187 ha) | | Also a designatedImportant Bird Area.[3][28] |
| Devil's Elbow Natural Area | Loyalsock | Lycoming | 404 acres (163 ha) | | Protects a population ofpitcher plants.[29][30] |
| East Branch Swamp Natural Area | Sproul | Clinton | 186 acres (75 ha) | | [24][31] |
| Forrest H. Dutlinger Natural Area | Susquehannock | Clinton | 1,521 acres (616 ha) | | Named after an early Commonwealth forester; includes old growth forest remnants.[32][33] |
| Frank E. Masland Natural Area | Tuscarora | Perry | 1,270 acres (514 ha) | | Also a designated Reptile and Amphibian Protection Area.[34][35] |
| Halfway Run Natural Area | Bald Eagle | Union | 407 acres (165 ha) | | [11][36] |
| Hemlocks Natural Area | Tuscarora | Perry | 120 acres (49 ha) | | [34][37] |
| The Hook Natural Area | Bald Eagle | Union | 5,119 acres (2,072 ha) | | Encompasses an entire regional watershed.[11][38] |
| Hoverter and Sholl Box Huckleberry Natural Area | Tuscarora | Perry | 10 acres (4 ha) | 1967 | Features a rare box huckleberry colony believed to be more than 1,300 years old.[34][39] |
| Jakey Hollow Natural Area | Weiser | Columbia | 59 acres (24 ha) | 1990 | [40][41] |
| Johnson Run Natural Area | Elk | Cameron | 216 acres (87 ha) | | [42][43] |
| Joyce Kilmer Natural Area | Bald Eagle | Union | 77 acres (31 ha) | 1921 | Named after thepoet and naturalist.[11][44] |
| Kettle Creek Gorge Natural Area | Loyalsock | Sullivan | 774 acres (313 ha) | 1970 | Traversed by theLoyalsock Trail.[29][45] |
| Lebo Red Pine Natural Area | Tiadaghton | Lycoming | 124 acres (50 ha) | | Encompasses an uncommon (for Pennsylvania) unplanted grove ofred pines.[6][46] |
| Little Juniata Natural Area | Rothrock | Huntingdon | 624 acres (253 ha) | | [3][47] |
| Little Mud Pond Swamp Natural Area | Delaware | Pike | 182 acres (74 ha) | | Encompasses aboreal swamp.[18][48] |
| Little Tinicum Island Natural Area | William Penn | Delaware | 80 acres (32 ha) | | An island in theDelaware River.[26][49] |
| Lower Jerry Run Natural Area | Elk | Cameron | 892 acres (361 ha) | | [42][50] |
| Marion Brooks Natural Area | Moshannon | Elk | 975 acres (395 ha) | | Named after an area conservationist. Includes one of the largest known stands ofwhite birch trees in the eastern United States.[51][52] |
| Meeting of the Pines Natural Area | Michaux | Franklin | 611 acres (247 ha) | 1974 | Adjacent to thePenn State Mont Alto campus.[13][53] |
| Miller Run Natural Area | Tiadaghton | Lycoming | 4,992 acres (2,020 ha) | | [6][54] |
| M.K. Goddard/Wykoff Run Natural Area | Elk | Cameron | 1,215 acres (492 ha) | 1965 | Features industrial ruins from nuclear research in the 1950s-60s. Partially renamed in the 2010s as a tribute toMaurice K. Goddard.[42][55] |
| Mount Cydonia Ponds Natural Area | Michaux | Franklin | 183 acres (74 ha) | | Encompasses about 60vernal ponds.[13][56] |
| Mount Davis Natural Area | Forbes | Somerset | 581 acres (235 ha) | | Includes thehighest point in Pennsylvania.[57][58] |
| Mount Logan Natural Area | Bald Eagle | Clinton | 512 acres (207 ha) | | Also a designated Reptile and Amphibian Protection Area.[11][59] |
| Pennel Run Natural Area | Delaware | Pike | 936 acres (379 ha) | | [18][60] |
| Pine Creek Gorge Natural Area | Tioga | Tioga | 12,163 acres (4,922 ha) | 1968 | Also aNational Natural Landmark; largest of the State Forest Natural Areas. Traversed by theWest Rim Trail andPine Creek Rail Trail.[16][61] |
| Pine Lake Natural Area | Delaware | Pike | 67 acres (27 ha) | | [18][62] |
| Pine Ridge Natural Area | Buchanan | Bedford | 568 acres (230 ha) | 1970 | Features reclaimed farms and resettlement lands.[63][64] |
| Pine Tree Trail Natural Area | Elk | Elk | 276 acres (112 ha) | | Named after an interpretative trail featuring educational exhibits.[42][65] |
| Reynolds Spring Natural Area | Tioga | Lycoming,Tioga | 1,302 acres (527 ha) | | [16][66] |
| Roaring Run Natural Area | Forbes | Westmoreland | 3,582 acres (1,450 ha) | 1975 | [57][67] |
| Rocky Ridge Natural Area | Rothrock | Huntingdon | 150 acres (61 ha) | | [3][68] |
| Rosencrans Bog Natural Area | Bald Eagle | Clinton | 152 acres (62 ha) | | [11][69] |
| Ruth Zimmerman Natural Area | William Penn | Berks | 33 acres (13 ha) | | Named after its former landowner; consists of two tracts.[26][70] |
| Sheets Island Archipelago Natural Area | Weiser | Dauphin | 70 acres (28 ha) | | A series of islands in theSusquehanna River.[40][71] |
| Snyder-Middleswarth Natural Area | Bald Eagle | Snyder | 500 acres (202 ha) | 1921 | Includes old growth forest that was scheduled to be logged in 1902.[11][72] |
| Spruce Swamp Natural Area | Pinchot | Lackawanna | 87 acres (35 ha) | | Includes a glacial bog.[73][74] |
| Stillwater Natural Area | Delaware | Pike | 1,931 acres (781 ha) | | Traversed by theThunder Swamp Trail. Originated as a sanctuary forCivil War deserters.[18][75] |
| Sweet Root Natural Area | Buchanan | Bedford | 1,400 acres (567 ha) | 1921 | Includes old-growth hemlocks demonstratingwoolly adelgid damage.[63][76] |
| Tall Timbers Natural Area | Bald Eagle | Snyder | 660 acres (267 ha) | | [11][77] |
| Tamarack Run Natural Area | Loyalsock | Sullivan | 234 acres (95 ha) | | [29][78] |
| Tamarack Swamp Natural Area | Sproul | Clinton | 267 acres (108 ha) | 1998 | Includes aboreal bog.[24][79] |
| Torbert Island Natural Area | Tiadaghton | Lycoming | 18 acres (7 ha) | | A large island and smaller nearby islands inPine Creek.[6][80] |