Which mountain has the world's largest above-sea-level volume?

Mauna Loa has the world's largest above-sea-level mountain volume.

The Hawaiian shield volcano forms more than half of Hawaiʻi Island and has a broad, gently sloping profile built by highly fluid basaltic lava. Its total volume is commonly estimated at roughly 18,000 cubic miles, or about 75,000 cubic kilometres, although estimates vary because neighbouring volcanoes overlap underground.

Mauna Loa is not the highest mountain above sea level in Hawaii: nearby Mauna Kea is slightly taller, reaching about 4,205 metres compared with Mauna Loa's roughly 4,170 metres. Mauna Loa wins on bulk because its immense shield spreads across a much larger area.

The name means “Long Mountain” in Hawaiian. The volcano has likely been erupting for at least 700,000 years and remains active; its most recent eruption lasted from 27 November to 13 December 2022. Submarine flanks and crustal flexure make its full geological dimensions even greater.