DEEP valley with very steep to straight sides and is almost equal in width at its top and its bottom.Example- Talari Gorges, Victoria Falls Gorge, Olduvai Gorge, Canyon Lake Gorge, etc.A canyon is a narrow and deep passage that CUTS through the Earth's surface and has steep cliffs on both sides.Relief, in geography, refers to the lowest and highest elevation points of an area.A strait is a narrow WATER body connecting TWO large water BODIES.