S: (n) climatic zone (any of the geographical zones loosely divided according to prevailing climate and latitude)
S: (n) time zone (any of the 24 regions of the globe (loosely divided by longitude) throughout which the same standard time is used)
S: (n) transit zone (a six million square mile area that includes the Caribbean and the Gulf of Mexico and the eastern Pacific Ocean; includes the principal routes used by drug smugglers)