Terrestrial canyons like the Grand Canyon, USA are spectacular geomorphic features carved out over millions of years by river erosion. They can extend for many hundreds of kilometres, have a width of up to 29 Km, and be as deep as 6 Km. However, the submerged margins of continental landmasses are also host to huge canyons systems; the scale of which can rival canyons on land. These submarine canyons extend from the shallow shelf down the deep oceans, and are host to a wide diversity of life.
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