The largest volcano on Earth is Mauna Loa, located on the Big Island of Hawaii. It is a shield volcano that covers an area of approximately 2,035 square miles (5,271 square kilometers) and rises about 13,681 feet (4,170 meters) above sea level. However, when measured from its base on the ocean floor, it exceeds 30,000 feet, making it the tallest mountain on Earth. Mauna Loa is one of the most active volcanoes in the world, with its last eruption occurring in 2022. Its size and frequent activity contribute to its status as a significant geological feature.