The largest volcano in the world is Mauna Loa, located on the Big Island of Hawaii. Mauna Loa is a shield volcano, characterized by its broad, gently sloping sides formed by the effusive eruption of low-viscosity lava. It 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, although its true height from base to summit, including its underwater portion, is about 30,000 feet (9,144 meters). Mauna Loa is an active volcano, with its last eruption occurring in November 2022, and is closely monitored for its geological activity.