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In page Colorado:

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The Rocky Mountains within Colorado contain 53 true peaks and 58 named peaks[1] that are 14,000 feet (4,267 m) or higher in elevation above sea level, known as fourteeners.[2] These mountains are largely covered with trees such as conifers and aspens up to the tree line, at an elevation of about 12,000 feet (3,658 m) in southern Colorado to about 10,500 feet (3,200 m) in northern Colorado. Above this tree line, only alpine vegetation grows.[citation needed]