Zone, region (4)
I believe the answer is:
area
I believe this clue is a double definition.
'zone' is the first definition.
(I've seen this before)
'region' is the second definition.
(area is a kind of region)
(Other definitions for area that I've seen before include "Field -- expanse" , "District; locale" , "Extent of a two-dimensional surface" , "part of town" , "Patch" .)