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Grand Canyon, USA
Grand Canyon is a steep and narrow valley that was formed due to the flow of the Colorado River in Arizona, USA. The formation of Grand Canyon about 5,000 years ago has exposed the geological history of 2 billion years. The colorful layers of the rock show the geological background of different time and the oldest exposed rock dates back to 1.8 billion years. The length of this canyon is about 446 km (277 miles) with an average depth of one mile. Grand Canyon is one of the best natural places to visit in the United States. Most of the people usually go to the southern rim of Grand Canyon to enjoy and capture the most amazing views.
