Mauna Loa is the WORLDS LARGEST VOLCANO. Mauna Loa is located in Hawaii and it is 13, 677 FEET AND 4, 169 METERS ABOVE SEA IEVEL! Mauna Loa is still erupting and active. The longest eruption lasted 18 MOUNTHS in 1855-1856. In 1984 an eruption sent lava flowing 4 miles. Mauna Loa is also atached to Kilauea.