This photo was taken by my husband Alessio during the excursion to the Grand Canyon and I dedicate it to him. The result was more than satisfactory saw the air gaps and the adrelina around! The river that flows naturally is the Colorado, the sculptor of the bellssimo Canyon ! I leave a little 'history recovered from Wikipedia:
The Grand Canyon is an enormous gorge created by the Colorado River in northern Arizona . It is about 446 km long , up to 1,600 meters deep , with a width varying from 500 meters to 27 kilometers. For the most part is included in the national park of the Grand Canyon , one of the first national parks in the United States. President Theodore Roosevelt was very fond of the Grand Canyon area , and visited it several times, for hunting pumas and admire the scenery.
Nearly two billion years of Earth's history have emerged to light thanks to the action of the Colorado and its tributaries , which over millions of years have eroded layer after layer of sediment , and by lifting the Colorado Plateau.
The first European to see the Grand Canyon was García López de Cárdenas, the Spanish , who in 1540 set off from New Mexico in search of the mysterious river they were talking about the Hopi Indians . The first scientific expedition to the canyon was led by Major John Wesley Powell U.S. at the end of the 70s of the XIX century. Powell described the sedimentary rocks exposed in the canyon as " pages of a great book of history." However , long before these discoveries, the area was inhabited by Native Americans who built settlements within the walls of the canyon.