What is The most massive single mountain on Earth is located in which national park?

The most massive single mountain on Earth is Mauna Loa, located in Hawaii Volcanoes National Park. Mauna Loa 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. Its vast size and volume make it the largest mountain by mass on the planet.