Which mountain that is wholly above sea level is the tallest when measured from base to peak?

Although Everest is the highest peak in the world above mean sea level, it raises only about 3700 meters above its base. By contrast, Denali raises from about 5500 meters from its base. The peak of Denali is at 6190 meters. Including mountains that raise from the ocean floor is not part of this question.

There is a distinction between measuring "highest" and "tallest." The highest mountain is determined by measuring a mountain's highest point above sea level. The tallest mountain is measured from base to summit. Using that measurement, Denali is taller than Mount Everest. Denali rises about 18,000 feet (5,500 meters) from its base, which is a greater vertical rise than Everest's 12,000-foot rise (3,700 meters) from its base at 17,000 feet (5,200 meters).

Denali was previously named Mount McKinley but has been officially renamed to the Athabascan traditional name for it. Denali means "the tall one" or "the great one." Denali is the highest peak on the North American continent. It is located in central Alaska.

Although it is possible to climb Denali from its base most climbers get flown onto a glacier from Talkeetna or another location and begin their ascent from there. Times to ascend and descend continually shorten with new technology, but most climbers plan for three to four weeks to complete the mission. At a latitude of 63°N, climbing season is typically at a time when there is no nightfall, so climbers can choose the best "time of day" to be actively climbing.