Mesa Arch, Canyonlands National Park:

Canyonlands National Park is a U.S. National Park located in southeastern Utah near the town of Moab and preserves a colorful landscape eroded into countless canyons, mesas and buttes by the Colorado River, the Green River, and their respective tributaries. The park is divided into four districts: the Island in the Sky, the Needles, the Maze, and the rivers themselves. While these areas share a primitive desert atmosphere, each retains its own character. Two large river canyons are carved into the Colorado Plateau by the Colorado River and Green River.Author Edward Abbey, a frequent visitor, described the Canyonlands as "the most weird, wonderful, magical place on earth—there is nothing else like it anywhere."Canyonlands is a popular recreational destination. On average 440,039 people visited the park each year.The geography of the park is well suited to a number of different recreational uses. Hikers, mountain bikers, backpackers, and four-wheelers all enjoy traveling the rugged, remote trails within the Park.Rafters and kayakers float the calm stretches of the Green River and Colorado River above the Confluence. Below the Confluence, Cataract Canyon contains powerful whitewater rapids, similar to those found in the Grand Canyon. However, since there is no large impoundment on the Colorado River above Canyonlands National Park, river flow through the Confluence is determined by snowmelt, not management. As a result, and in combination with Cataract Canyon's unique graben geology, this stretch of river offers the largest whitewater in North America in heavy snow years.The Island in the Sky district, with its proximity to the Moab, Utah area, attracts the majority of park users. The Needles district is the second most visited, drawing 35 percent of visitors. The rivers within the park and the remote Maze district each only account for 3 percent of park visitation.Political compromise at the time of the park's creation limited the protected area to an arbitrary portion of the Canyonlands basin. Conservationists hope to complete the park by bringing the boundaries up to the high sandstone rims that form the natural border of the Canyonlands landscape.The Colorado River and Green River combine within the park, dividing it into four distinct districts. Below the confluence, the Colorado River flows through Cataract Canyon.The Island in the Sky district is a broad and level mesa to the north of the park between Colorado and Green river with many overlooks from the White Rim, a sandstone bench 1,200 feet below the Island, and the rivers, which are another 1,000 feet below the White Rim.The Needles district is located east of the Colorado River and is named after the red and white banded rock pinnacles which dominate it, but various other forms of naturally sculptured rock such as canyons, grabens, potholes, and a number of arches similar to the ones of the nearby Arches National Park can be found as well. Unlike Arches National Park, where many arches are accessible by short to moderate hikes or even by car, most of the arches in the Needles district lie in back country canyons and require long hikes or four-wheel-drive trips to reach them.The area was once home of the Ancestral Puebloans, of which many traces can be found. Although the items and tools they used have been largely taken away by looters, some of their stone and mud dwellings are well-preserved.The Ancestral Puebloans also left traces in the form of petroglyphs, most notably on the so-called Newspaper Rock near the Visitor Center at the entrance of this district.The Maze district is located west of the Colorado and Green rivers is the least accessible section of the park, and one of the most remote and inaccessible areas of the United States.A geographically detached section of the park located west-northwest of the main unit, Horseshoe Canyon Unit, contains panels of rock art made by hunter-gatherers from the Late Archaic Period pre-dating the Ancestral Puebloans.Originally called Barrier Canyon, Horseshoe's artifacts, dwellings, pictographs, and murals are some of the oldest in America.It is believed that the images depicting horses date from after 1540 AD, after the Spanish re-introduced horses to America.A

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