Why is Australia considered the smallest continent?

Australia is considered the smallest continent primarily due to its total land area, which measures approximately 3 million square miles (7.7 million square km). When compared to the other six recognized continents—Asia, Africa, North America, South America, Antarctica, and Europe—Australia possesses the least amount of landmass.1234

While there is no single, strict scientific definition for a continent, geographers distinguish Australia from large islands like Greenland based on several criteria, including its distinct tectonic plate positioning, unique biological species, and specific anthropological history. Because Australia is classified as a continent, it is distinct from an island, which is defined as a landmass entirely surrounded by water that is smaller than a continent.1