United States -- West
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- Arches National Park -- A park of 76,519 acres, which contains the greatest density of natural arches in the world, located near the city of Moab, in the southeastern part of the US State of Utah.
- Badlands National Park -- A park of nearly 244,000 acres of sharply eroded buttes, pinnacles, and spires, and the largest protected mixed grass prairie in the country, located in the southwestern part of the US State of South Dakota.
- Bosque del Apache National Wildlife Refuge -- A refuge of 57,191 acres located along the Rio Grande near Socorro, in the US State of New Mexico.
- Buffalo National River -- A park of 94,293 acres along 135 miles of the 150-mile long river in the northwestern part of the US State of Arkansas.
- Charles M. Russell National Wildlife Refuge -- A refuge of approximately 1,100,000 acres extending 125 airline miles up the Missouri River from Fort Peck Dam in the north-central part of the US State of Montana.
- Craters of the Moon National Monument and Preserve -- A park encompassing three major lava fields and 250,000 acres of sagebrush steppe grasslands northeast of Twin Falls in the US State of Idaho.
- Grand Canyon National Park -- A park of 1,218,375 acres along the canyon of the Colorado River in the northwestern part of the US State of Arizona.
- Lathrop State Park -- A park of 1,594 acres, the first state park of the US State of Colorado, located south of Colorado Springs, near the city of Walsenburg.
- Lewis and Clark Caverns State Park -- A park of 3,034 acres, the first state park of the US State of Montana, located along the Jefferson River east of Butte.
- Meramec State Park -- A park of 6,896 acres, in a region that Daniel Boone helped to open, located southwest of St. Louis, in the US State of Missouri.
- Nerstrand Big Woods State Park -- A park created from a preserved woodlot, located between Minneapolis and Rochester, in the southeastern part of the US State of Minnesota.
- Petrified Forest National Park -- A park of 93,533 acres of grasslands and high desert plateau, located east of Flagstaff, in the northeastern part of the US State of Arizona.
- Rocky Mountain National Park -- A mountain park of 265,765 acres, located northwest of Boulder in the north-central part of the US State of Colorado.
- Theodore Roosevelt National Park -- A park of two units in the badlands of the west-central part of the US State of North Dakota, near the border of the State of Montana.
- Wind Cave National Park -- A park of 28,295 acres of mixed-grass prairie, ponderosa pine forest, and one of the world's longest caves, and located south of Rapid City in the southwest corner of the US State of South Dakota.
- Yellowstone National Park -- The world's first national park, consisting of 2,219,791 acres, located mainly in the northwest corner of the US State of Wyoming, but with small portions in the States of Idaho and Montana.
