The Grand Canyon is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile.
The Olduvai Gorge or Oldupai Gorge in Tanzania is one of the most important paleoanthropological sites in the world; it has proven invaluable in furthering our understanding of early human evolution. A steep-sided ravine in the Great Rift Valley that stretches across East Africa, it is about 48 km (30 mi) long, and is located in the eastern Serengeti Plains in the Arusha Region not far, about 45 kilometres, from Laetoli, another important archaeological site of early human occupation. The British/Kenyan paleoanthropologist-archeologist team Mary and Louis Leakey established and developed the excavation and research programs at Olduvai Gorge which achieved great advances of human knowledge and world-renowned status.
The Acheron is a river located in the Epirus region of northwest Greece. It is 52 km (32 mi) long, and its drainage area is 705 km2 (272 sq mi). Its source is near the village Zotiko, in the southwestern part of the Ioannina regional unit and it flows into the Ionian Sea in Ammoudia, near Parga.
Palo Duro Canyon is a canyon system of the Caprock Escarpment located in the Texas Panhandle near the cities of Amarillo and Canyon. As the second-largest canyon in the United States, it is roughly 120 mi (190 km) long and has an average width of 6 mi (9.7 km), but reaches a width of 20 mi (32 km) at places. Its depth is around 820 ft (250 m), but in some locations, it increases to 1,000 ft (300 m). Palo Duro Canyon has been named "The Grand Canyon of Texas" both for its size and for its dramatic geological features, including the multicolored layers of rock and steep mesa walls similar to those in the Grand Canyon.
Glen Coe is a glen of volcanic origins, in the Highlands of Scotland. It lies in the north of the county of Argyll, close to the border with the historic province of Lochaber, within the modern council area of Highland. The scenic beauty of the glen has led to its inclusion in the Ben Nevis and Glen Coe National Scenic Area, one of 40 such areas in Scotland. A review of the national scenic areas by Scottish Natural Heritage in 2010 made reference to the "soaring, dramatic splendour of Glen Coe", and "the suddenness of the transition between high mountain pass and the lightly wooded strath" in the lower glen. It also described the journey through the glen on the main A82 road as "one of the classic Highland journeys". The main settlement is the village of Glencoe located at the foot of the glen. The glen is regarded as the home of Scottish mountaineering and is popular with hillwalkers and climbers.
Valles Marineris is a system of canyons that runs along the Martian surface east of the Tharsis region. At more than 4,000 km (2,500 mi) long, 200 km (120 mi) wide and up to 7 km (23,000 ft) deep, Valles Marineris is one of the largest canyons of the Solar System, surpassed in length only by the rift valleys of Earth.
Waimea Canyon, also known as the Grand Canyon of the Pacific, is a large canyon, approximately ten miles (16 km) long and up to 3,000 feet deep, located on the western side of Kauaʻi in the Hawaiian Islands of the United States. Waimea is Hawaiian for "reddish water", a reference to the erosion of the canyon's red soil. The canyon was formed by a deep incision of the Waimea River arising from the extreme rainfall on the island's central peak, Mount Waiʻaleʻale, among the wettest places on earth.
The Royal Gorge is a canyon of the Arkansas River located west of Cañon City, Colorado. The canyon begins at the mouth of Grape Creek about 2 mi (3.2 km) west of central Cañon City and continues in a west-northwesterly direction for approximately 6 mi (9.7 km) until ending near U.S. Route 50. Being one of the deepest canyons in Colorado, it is also known as the Grand Canyon of the Arkansas (River), with a maximum depth of 1,250 ft (380 m). The canyon is also very narrow, measuring from 50 ft (15 m) wide at its base to 300 ft (91 m) wide at its top, as it carves a path through the granite formations below Fremont Peak and YMCA Mountain, which rise above the north and south rims, respectively.
The Yarlung Tsangpo Grand Canyon or Yarlung Zangbo Grand Canyon or simply the Tsangpo Canyon, Brahmaputra Canyon or Tsangpo Gorge, along the Yarlung Tsangpo River in Tibet Autonomous Region, China, is the deepest canyon in the world, and at 504.6 km is slightly longer than the Grand Canyon in the United States, making it one of the world's largest. The Yarlung Tsangpo originates near Mount Kailash and runs east for about 1700 km, draining a northern section of the Himalayas before it enters the gorge just downstream of Pei, Tibet near the settlement of Zhibe. The canyon has a length of about 240 km as the gorge bends around Mount Namcha Barwa and cuts its way through the eastern Himalayan range. Its waters drop from about 2,900 m near Pei to about 1,500 m at the end of the Upper Gorge where the Po Tsangpo River enters. The river continues through the Lower Gorge to the Indian border at an elevation of 660 m. The river then enters Arunachal Pradesh and eventually becomes the Brahmaputra.