The tallest volcano in the world is Mauna Kea, located in Hawaii. While Mount Everest is the highest peak on Earth when measured from sea level, Mauna Kea has the greatest height when measured from its base on the ocean floor. Mauna Kea rises about 4,205 meters (13,796 feet) above sea level, but its total height from its submerged base to its summit reaches about 9,144 meters (30,000 feet). Mount Kilimanjaro, Mount Everest, and Mount Fuji are significant mountains but are not considered the tallest volcanoes.