The Western Hemisphere, also Western hemisphere or western hemisphere, is a geographical term for the half of the Earth that lies west of the Prime Meriian (which crosses Greenwich in London, England, United Kingdom), the other half being the eastern hemisphere. It is also used to specifically refer to the Americas (or the New World) and adjacent waters, while excluding other territories that lie geographically in the hemisphere (parts of Africa, Europe, Antarctica, and Asia); thus, it is sometimes referred to as the American hemisphere.Western hemisphere is sometimes used as an equivalent for the geopolitical construct, the Western World, which typically includes the Americas, Europe and Australia.