The Grand Canyon is one of the most visited places in Arizona. It is a gorge of the Colorado river. This rocky structure is at least 17 million years old. The river had eroded the canyon since then to form what we see today.
The Grand Canyon is 446 km long, up to 29 km wide and is around 2 km deep in some places. The narrowest point us more than six kilometres wide. Nearly 40 major sedimentary rock layers are exposed in the Grand Canyon. These layers contain millions of years of geological history. Some of these layers are two billion years old.
The Grand Canyon was designated a World Heritage Site by the UNESCO in 1979.
Picture Credit : Google