Established 2/25/1928 Size 35,835.08 acres (145.0 km2) Bryce Canyon is a giant natural amphitheatre along the Paunsaugunt Plateau. The unique area has hundreds of tall hoodoos formed by erosion. The region was originally settled by Native Americans and later by Mormon pioneers.[13]

Established 10/21/1999 Size 32,950.03 acres (133.3 km2) The park protects a quarter of the Gunnison River, which has dark canyon walls from the Precambrian era. The canyon has very steep descents, and it is a site for river rafting and rock climbing. The narrow, steep canyon, made of gneiss and schist, is often in shadow, appearing black.[12]

https://www.nps.gov/bibe/

Established 6/12/1944 Size 801,163.21 acres (3,242.2 km2) Named for the Bend of the Rio Grande along the US–Mexico border, this park includes a part of the Chihuahuan Desert. A wide variety of Cretaceous and Tertiary fossils as well as cultural artifacts of Native Americans exist within its borders.[10]

Established 11/10/1978 Size 242,755.94 acres (982.4 km2) The Badlands are a collection of buttes, pinnacles, spires, and grass prairies. It has the world's richest fossil beds from the Oligocene epoch, and there is wildlife including bison, bighorn sheep, black-footed ferrets, and swift foxes.[9]

Established 11/12/1971 Size 76,518.98 acres (309.7 km2) This site features more than 2,000 natural sandstone arches, including the Delicate Arch. In a desert climate millions of years of erosion have led to these structures, and the arid ground has life-sustaining soil crust and potholes, natural water-collecting basins. Other geologic formations are stone columns, spires, fins, and towers.[8]

Established 2/26/1919 Size 47,389.67 acres (191.8 km2) Covering most of Mount Desert Island and other coastal islands, Acadia features the tallest mountain on the Atlantic coast, granite peaks, ocean shoreline, woodlands, and lakes. There are freshwater, estuary, forest, and intertidal habitats.[6]