A spherical lune is a digon whose two vertices are antipodal points on the sphere. The quotient of the cube by the antipodal map yields a projective polyhedron, the hemicube. South Georgia Island is antipodal to the northernmost part of Sakhalin Island. It is understood that antipodal points on the equator represent a single line. Each of the R lines in this construction intersects the sphere at two antipodal points. The "n"-dimensional real projective space is the quotient of the "n"-sphere by the antipodal map. This is because there are no antipodal points in elliptic geometry. Hellas Planitia is antipodal to Alba Patera. Gibraltar is approximately antipodal to Te Arai Beach about north of Auckland, New Zealand. The "elliptic space" is formed by from by identifying antipodal points. The inverse image of every point of consist of two antipodal points. Lake Baikal is partially antipodal to the Straits of Magellan. It is the direct product of with the antipodal map, sending to . Serawa is the only village in India to be antipodal to a human settlement. The requirement to pass at least two antipodal points causes some problems in route planning.