South of the Rockies is the hot dry state of Arizona where the land has fantastic colours not just brown and green but red, pink, orange, and blue The most famous place in Arizona is the Grand Canyon This deep river valley was made by the Colorado River cutting through the rock many thousands of year ago Today it is 1600 better deep 446 kilometers long, and between 0.4 and 24 kilometres wide with rocks in extraordinary shapes You can walk down to the river but it will take you two days to get there and back and you must take plenty of water to drink