Stelios Valtzis

Stelios Valtzis

Wrather Arch is a cave type natural arch in the Paria Canyon-Vermilion Cliffs Wilderness. The sandstone arch is located in the eponymous Wrather Canyon, a short side canyon of Paria Canyon. Wrather Arch was first spotted by a local pilot from Page, Arizona, Royce K Knight. A news bulletin from National Geographic in 1966, states, "Tall as

Kachina Natural Bridge / Rank 20th based on estimated span length only.

Snake Bridge / Rank 19th based on estimated span length only.

Stevens Arch / Rank 14th based on estimated span length only.

Sipapu Bridge is a natural bridge or arch located in the Natural Bridges National Monument in central San Juan County, Utah, United States. The bridge spans White Canyon. Sipapu has a span of 255 feet (78 m), demoting the arch to a thirteenth place ranking. It is also the sixth longest natural bridge after the more well-known Rainbow Bridge also

Glen Canyon National Recreation Area encompasses the area around Lake Powell and lower Cataract Canyon in Utah and Arizona, covering 1,254,429 acres (5,076 km2) of mostly desert. The Glen Canyon NRA was established in 1972 "to provide for public use and enjoyment and to preserve the area's scientific, historic, and scenic features." The stated purpose of

Rainbow Bridge National Monument is often described as the world's highest natural bridge. The span of Rainbow Bridge according to definition by the Natural Arch and Bridge Society in 2007 resulted in a value of 234 feet (71 m). At the top it is 42 feet (13 m) thick and 33 feet (10 m) wide. The bridge, which is of cultural importance to a number of

Grandstaff Canyon is a canyon in southern Utah. It is part of the Colorado River watershed. A trailhead which gives hiking access into the canyon is located directly adjacent to Utah State Route 128 (SR‑128). The Morning Glory Arch is located in the canyon about 2.5 miles (4.0 km) from the trailhead and has a length of 943 feet (287 m). The

Aloba Arch is the name of a natural arch located in Chad. Large natural arches are somewhat rare outside the southern and western regions of China and the Colorado Plateau of the southwest United States. Chad's Ennedi Plateau has a geology similar to the Colorado Plateau and has produced a number of natural arches and similar landforms, although

Cedar Breaks National Monument is a U.S. National Monumen. Cedar Breaks is a natural amphitheater, stretching across 3 miles (4.8 km), with a depth of over 2,000 feet (610 m). The elevation of the rim of the amphitheater is over 10,000 feet (3,000 m) above sea level. The rock of the amphitheater is more eroded than, but otherwise