An antipode is the point diametrically opposite on the Earth's surface.
NOTE - Mainland may refer to the predominant island(s) of a nation. In many cases, you must type in a territory/region/island/etc instead of the country it belongs to, if that territory is the antipode sought. The country name is only valid for what is considered its mainland. The Antipode sought may be more specific than the types of regions in the left-hand columns, i.e. an exact island.