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]