In fact, when measured from their base on the ocean floor, Mauna Kea and Mauna Loa on the island of Hawaii rise some 33,000 feet [10,000 m]. Thus, they are in a sense the world’s tallest mountains!

Mauna Kea, which is considered to be dormant and boasts the highest point in Hawaii, 13,796 feet [4,205 m] above sea level;