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The land of the Rockies is made up of quite distinct and separate regions that are shaped by different geological events. One region was formed of material, which was washed down from the Rockies and pressed into rock. This now encompasses the high Colorado Plateaus, where the Grand Canyon of the Colorado River is cut (1.6 km in depth). The Mississippi flows over 6,400 km from its northern sources in the Rocky Mountains to the Gulf Mexico. This makes it one of the world’s longest waterways. Another region, the high Columbia table land to the north was created by lava that poured from inside the earth and buried old mountains.