Earth's Largest Volcano-Mauna Loa,Hawaii The largest volcano in the world is Mauna Loa on the island of Hawaii.There have been references to Yellowstone as the largest vol … canic system in North America, but most, if not all, scientific organizations recognize Mauna Loa as the largest single volcano.he world's largest volcano is Mauna Loa on the island of Hawaii. It only rises 4 km above sea level, but from its own base under the ocean (and into the ocean floor), its summit is just over 9 km above its base (approximately 30,000 feet). It also erupts regularly, with the latest eruption being in 1984.