(IMG) africa
 (IMG) antarctic
 (IMG) arctic
 (IMG) asia
 (IMG) central_america
 (IMG) europe
 (IMG) middle_east
 (IMG) north_america
 (IMG) oceania
 (IMG) physical_world
 (IMG) political_world
 (IMG) south_america
 (IMG) southeast_asia
 (IMG) time_zones
 (IMG) united_states