* By surface area: The Australian continent is the largest landmass made primarily of bedrock. However, this is a bit of a simplification, as many continents have significant sedimentary rock formations.
* By volume: This is harder to define, as we don't have complete information on the Earth's subsurface. Some argue that the Tibetan Plateau might be the largest single block of rock, considering its immense size and elevation.
* By individual rock formation: The Siberian Traps are a vast volcanic plateau formed by massive lava flows, and they are arguably the single largest rock formation by volume.
Ultimately, there is no definitive answer to your question. It depends on how you define "largest" and what you consider a "landform."
