africa alaska aleutian islands algeria american samoa americas antarctica asia australia burkina faso cape verde cook islands earth eastern hemisphere england europe fiji france french polynesia geography geopolitics ghana greenland greenwich guinea guinea-bissau hemisphere iceland international date line ireland kiribati land hemisphere liberia london longitude mali mauritania morocco new world new zealand niue northern hemisphere oceania oxford dictionary of english portugal prime meridian russia samoa senegal sierra leone southern hemisphere spain togo tokelau tonga tuvalu united kingdom united states wallis and futuna water hemisphere west west antarctica western sahara