zone of interior

English Thesaurus

1. the part of the theater of war not included in the theater of operations (noun.location)

hypernym	:	region,
definition	:	a large indefinite location on the surface of the Earth (noun.location)

part meronym	:	theater of war, theatre of war,
definition	:	the entire land, sea, and air area that may become or is directly involved in war operations (noun.location)