It reaches a maximum depth of 7,900 feet (2,400 metres), making it the deepest gorge on the North American continent.
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From the top of the Seven Devils Mountains to the deepest part of the Snake River, Hells Canyon is nearly 8,000 feet deep. That's almost 2,000 feet deeper than the famous Grand Canyon in Arizona.
The Yarlung Zangbo Grand Canyon in Tibet, a region of southwestern China, was formed over millions of years by the Yarlung Zangbo River. This canyon is the deepest in the world—at some points extending more than 5,300 meters (17,490 feet) from top to bottom.
The Snake River is named for the Snake Indians, through whose country the greater part of the river flows. The Indians, in turn, were named Snake by their Plains neighbors to the east, possibly because they reputedly used snake heads painted on sticks to terrify their Plains enemies.
Strong currents run through the Snake River. One of the notable hazards in the Snake River is its rapid currents, particularly in certain sections of the river. These currents can quickly sweep away swimmers, boaters, or anglers, leading to potentially dangerous situations.
The name Hells Canyon is believed to come from the difficult and rugged journey through the terrain by boat. The first known reference to it as Hells Canyon is in the 1895 edition of H.W. McCurdy's “Marine History of the Pacific Northwest.”
The Congo is the deepest river in the world. Its headwaters are in the north-east of Zambia, between Lake Tanganyika and Lake Nyasa (Malawi), 1760 metres above sea level; it flows into the Atlantic Ocean.
Called the Mariana Trench, the underwater canyon descends 35,827 feet (10,920 meters) — the Grand Canyon only averages about 4,000 feet (1,200 meters) in depth.
The Mariana Trench is the deepest place on Earth, deeper than the height of Mount Everest above sea level. It is five times longer than the Grand Canyon and includes some 50,532,102 acres that are virtually unknown to humans.