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 Charleston
Mount Charleston, officially named Charleston Peak, at , is the highest mountain in both the Spring Mountains and Clark County, in Nevada, United States. It is the eighth-highest mountain in the state. Well separated from higher peaks by large, low basins, it is the most topographically prominent peak in Nevada, and the eighth-most-prominent peak in the contiguous United States. It is one of eight ultra-prominent peaks in Nevada. It is located about northwest of Las Vegas within the Mount Charleston Wilderness, which is within the Spring Mountains National Recreation Area of the Humboldt-Toiyabe National Forest.