(noun) The single continent on the world containing the City of Atlantis. The continent itself extends to within 50 km of either magnetic pole, and encompasses roughly a quarter of the planet's surface.
Mainland is usually the continental part of a region, as opposed to the islands nearby. Sometimes the residents are called "the Mainlanders". As a result of the usually larger area of mainland, there are significantly more mainlanders than islanders, and mainlander culture and politics sometimes threaten to dominate those of the islands.