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Ape Cave is a remarkably long lava tube situated within the Mount St. Helens National Volcanic Monument of Washington State. Formed by flowing lava during volcanic activity near St. Helens, it stretches over 2.5 miles and offers a unique glimpse into subterranean geological processes. The cave’s sig...

Midewin National Tallgrass Prairie is a restored area within Illinois encompassing approximately 8,700 acres. It represents the first national tallgrass prairie designated by the U.S. Forest Service. The site’s significance lies in its transformation of previously contaminated former military land i...

Little Missouri National Grassland encompasses more than one million acres of prairie land within North Dakota. This area’s notable badlands topography and diverse mixed-grass ecosystem provide unique opportunities for scientific research and conservation. It is primarily utilized by the U.S. Forest...

Buffalo Gap National Grassland spans nearly 600,000 acres across South Dakota’s mixed-grass prairie landscape. This US Forest Service managed area is notable for its significant badlands formations and crucial role in black-footed ferret conservation efforts. It provides opportunities for ecological...

Pawnee National Grassland is a significant prairie ecosystem within Colorado’s northeastern plains. Established following the devastating 1930s Dust Bowl, it preserves a unique shortgrass habitat. The grassland provides critical breeding grounds for numerous bird species and supports diverse plant l...

The Lava River Cave in Oregon represents a significant geological feature within the Newberry National Volcanic Monument. It is one of the longest continuous lava tubes in the United States, offering visitors an opportunity to explore a naturally formed subterranean passage created by flowing lava....

The Comanche National Grassland is a 125,000-acre prairie located in southeastern Colorado. Managed by the US Forest Service, it preserves significant paleontological resources including over 1,300 dinosaur tracks and ancient rock art sites. This shortgrass grassland provides habitat for diverse wil...

Oglala National Grassland is a federally managed grassland in northwestern Nebraska administered by the U.S. Forest Service. Its mixed-grass prairie and badlands include Toadstool Geologic Park, where erosion has exposed distinctive formations and fossil-bearing strata. The grassland also contains t...

Located in northeastern Wyoming, Thunder Basin National Grassland is a vast protected area covering over half a million acres of public land. Managed by the United States Forest Service, it serves as an important ecological transition zone between the Rocky Mountains to the west and the central Grea...

Subway Cave is an accessible lava tube located in Lassen Volcanic National Park in Northern California. It was created when the outer crust of a basaltic lava flow cooled and solidified while the molten interior continued to flow. The cave is managed by the National Park Service and features a devel...

Sheyenne National Grassland is a federally managed landscape in southeastern North Dakota administered by the United States Forest Service as part of the Dakota Prairie Grasslands. It protects an extensive tract of publicly owned tallgrass prairie mixed with sandy dunes, wetlands, oak groves, and ag...

The Cimarron National Grassland is a protected area spanning over 108,000 acres in southwestern Kansas, managed by the United States Forest Service. Established on lands devastated during the 1930s Dust Bowl, it is characterized by its shortgrass prairie ecosystem and native wildlife. The grassland...

Located in northeastern New Mexico, Kiowa National Grassland spans approximately 137,000 acres of shortgrass prairie and managed by the USDA Forest Service as part of the Cibola National Forest. The grassland features deep canyons along the Canadian River, including Mills Canyon, where early settler...

Grand River National Grassland encompasses approximately 155,077 acres in northwestern South Dakota, managed by the USDA Forest Service as part of the Dakota Prairie Grasslands complex. Established in 1960, the area protects mixed-grass prairie within the watershed of the Grand River, a tributary of...

Fort Pierre National Grassland is a federally managed grassland in central South Dakota, south of the state capital, Pierre. Administered by the United States Forest Service, it covers more than 115,000 acres of mixed-grass prairie interspersed with wetlands and other wildlife habitat. The area supp...

Black Kettle National Grassland is a federally managed area of mixed-grass prairie administered by the United States Forest Service in western Oklahoma, with an additional unit in the Texas Panhandle. Named for the Cheyenne leader Black Kettle, it consists of dispersed parcels rather than one contin...

Rita Blanca National Grassland is a United States Forest Service area located in the Texas and Oklahoma panhandles. It preserves shortgrass prairie habitat characteristic of the southern Great Plains. The grassland supports populations of grassland birds and other wildlife adapted to the semi-arid p...

Crooked River National Grassland is a federally managed landscape in central Oregon covering more than 100,000 acres of grassland, shrubland, and canyon terrain. Administered by the United States Forest Service as part of the Deschutes National Forest, it supports grazing, wildlife habitat, recreati...

Caddo and Lyndon B. Johnson National Grasslands are two United States Forest Service grassland units in Texas that are managed together as part of the National Forests and Grasslands in Texas. Caddo is located in Fannin County, while the LBJ unit covers land in North Texas including Wise and Montagu...

The Lyndon B. Johnson National Grassland is a United States Forest Service property in northern Texas, near Alvord in Wise County. It was renamed in 1974 to honor Lyndon B. Johnson, the 36th president of the United States. The area contains native grasslands, wooded Cross Timbers habitat, ponds, and...

Caddo National Grassland is a unit of the United States National Forest System in northeastern Texas, managed by the U.S. Forest Service. It consists of two separate areas and includes Lake Davy Crockett, a reservoir used for fishing, boating, and other outdoor recreation. The grassland combines pra...

McClellan Creek National Grassland is a United States Forest Service grassland in the Texas Panhandle. The site surrounds Lake McClellan and provides space for outdoor recreation in a shortgrass prairie setting. Covering 1,449 acres, it is recognized as the smallest national grassland in the United...