subregion

Definitions

Wine

  • in general use, a wine-producing area that is part of a larger region
  • in the Australian system of Geographic Indications, a subregion is defined in the same way as a region (a single tract of land containing at least 5 independently owned wineries of at least 5 hectares each and usually producing at least 500 tons of wine grapes per year), but it must have ‘substantial’ rather than just ‘measurable’ homogeneity in grape-growing attributes over its area
http://www.dictionarycentral.com/definition/subregion.html