The Grand Canyon.

1.The Grand Canyon ranges from 4 to 18 miles wide (6 - 28km) and is 277 miles long (445km) (that's river miles).

2.On average, it is 5000 feet deep (1,524m or over half a kilometre deep)

3.The entire Grand Canyon is essentially tilted: the northern rim is 1200 ft higher than the southern rim.

4.The climate within the canyon is semi-arid, and the floor in Summer can heat up to 106 degrees Fahrenheit (40 degrees Celsius).

5.It is the third largest canyon in the world (exceeded by Barranca de Cabre in Northern Mexico and Hell's Canyon in Idaho).

6.Around 88 species of mammals, 250 - 300 species of birds, 25 types of reptiles and five species of amphibians all live in the Grand Canyon.

7.The first white man to discover the Grand Canyon was García López de Cárdenas in 1540.