Alan Seeger Natural Area: Huntingdon County, 390 acres (160 ha) north of Greenwood Furnace State Park.
 Includes about 25 acres (10 ha) of old-growth Eastern white pine and Eastern hemlock, with some trees 4.5 feet (1.4 m) in diameter and nearly 1,000 years old.

Bear Meadows Natural Area: Centre County, 890 acres (360 ha) four miles south of Boalsburg.
 Protects a 320 acres (130 ha) boreal bog with old-growth black spruce and balsam fir forests.

Big Flat Laurel Natural Area: Huntingdon and Centre Counties, 184 acres (74 ha) four miles south of Boalsburg.
 Includes extensive stands of mountain laurel.

Detweiler Run Natural Area: Huntingdon County, 463 acres (187 ha) southeast of Boalsburg.
 Includes 185 acres (75 ha) of old-growth Eastern white pine and Eastern hemlock forests above a Rhododendron understory.

Little Juniata Natural Area: Huntingdon County, 624 acres (253 ha) west of Barree.
 Includes a slope of Tuscarora sandstone scree and a horizontal thrust fault.

Rocky Ridge Natural Area: Huntingdon County, 150 acres (61 ha) south of Martin Gap.
 Includes exposed sandstone and limestone beneath an oak woodland.
Alan Seeger Natural Area: Huntingdon County, 390 acres (160 ha) north of Greenwood Furnace State Park.  Includes about 25 acres (10 ha) of old-growth Eastern white pine and Eastern hemlock, with some trees 4.5 feet (1.4 m) in diameter and nearly 1,000 years old.
Bear Meadows Natural Area: Centre County, 890 acres (360 ha) four miles south of Boalsburg.  Protects a 320 acres (130 ha) boreal bog with old-growth black spruce and balsam fir forests.
Big Flat Laurel Natural Area: Huntingdon and Centre Counties, 184 acres (74 ha) four miles south of Boalsburg.  Includes extensive stands of mountain laurel.
Detweiler Run Natural Area: Huntingdon County, 463 acres (187 ha) southeast of Boalsburg.  Includes 185 acres (75 ha) of old-growth Eastern white pine and Eastern hemlock forests above a Rhododendron understory.
Little Juniata Natural Area: Huntingdon County, 624 acres (253 ha) west of Barree.  Includes a slope of Tuscarora sandstone scree and a horizontal thrust fault.
Rocky Ridge Natural Area: Huntingdon County, 150 acres (61 ha) south of Martin Gap.  Includes exposed sandstone and limestone beneath an oak woodland.
Rothrock State Forest