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Wiktionary
subzone

n. A zone making up part of a larger zone.

Wikipedia
Subzone

The Subzone is a fictional place used as part of Subway's Subway-Kids.com's ad campaign aimed toward young audiences. It is mostly used as a residential area for the Subway Kids who themselves are spokespeople for the campaign. The sub in Subzone is a reference to Subway or Submarine sandwiches. The Subzone campaign on subway-kids.com, as of March 2007 has been abandoned.

Usage examples of "subzone".

The village of junked cars was especially odd, because farther on was a hillside of uninhabited housesprobably a quarantine order, or a subzone in the making.

The very motion of the earth, its tides and shifting subzones, are related to the moon.