Mountain
Heights of mountains are typically measured above sea level. Using this metric, Mount Everest is the highest mountain on Earth, at . There are at least 100 mountains with heights of over above sea level, all of which are located in central and southern Asia. The highest mountains above sea level are generally not the highest above the surrounding terrain. There is no precise definition of surrounding base, but Denali, Mount Kilimanjaro and Nanga Parbat are possible candidates for the tallest mountain on land by this measure. The bases of mountain islands are below sea level, and given this consideration Mauna Kea ( above sea level) is the world's tallest mountain and volcano, rising about from the Pacific Ocean floor.
Mount Collins
Like most of the Smokies crest, Mount Collins is situated along the Tennessee-North Carolina border, with Sevier County to the north and Swain County to the south. The mountain rises approximately above its southeastern base near Bryson City and just over above its northwestern base near Meigs Post Prong . The mountain is the 25th-highest mountain in the Eastern United States, the 7th-highest in Tennessee, and the 10th-highest in the Great Smoky Mountains National Park.