<Tr> <Th> Type </Th> <Td> canyon </Td> </Tr> <Tr> <Th> Watercourses </Th> <Td> Arkansas River </Td> </Tr> <P> 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 . </P> <P> The path of the Arkansas River was already set when the granite uplift that would eventually form the Rocky Mountains began . About 3 million years ago as the mountains began to rise from the surrounding plains, the Arkansas River--then only a small stream--began to wear away at the stone it flowed across . Scientists estimate that the mountains surrounding the canyon rose at a rate of approximately one foot every 2500 years . Over the millennia, this small stream grew, cutting a deep channel for itself through the surrounding granite . The gorge's peculiar shape, contrasted to broad canyons such as the Grand Canyon, can be attributed to this long, direct erosion through hard rock . </P>

Where is the royal gorge located in colorado