Mauna Kea is the world’s tallest active volcano, rising 13,803 feet above sea level. However, if measured from its underwater base, it is the tallest volcano in the world, higher than even Mount Everest. Mauna Kea measures 33,500 from its base, making it the tallest mountain in the world. It is currently dormant.
     Tamu Massif was considered the world’s largest volcano, located on the Pacific floor, about 990 miles east of Japan. But in 2019, new studies determined it to be a volcanic system rather than a single volcano. The world’s new largest volcano is now Mauna Loa, located just 35 miles southwest of Mauna Kea.
     Ojos del Salado is the world’s highest, measuring 22,569 feet above sea level, but only approximately 6,562 feet above its base. Ojos del Salado is located in South America on the Chile and Argentina border.
     Kilauea volcano is the world’s most active, located in the southern part of Hawaii, known as Big Island. It has been erupting since 1983.