Synonyms of outpost
borderThe border between two countries or regions is the dividing line between them. Sometimes the border also refers to the land close to this line.
• Clifford is enjoying life north of the border.
frontierA frontier is a border between two countries.
• It wasn't difficult to cross the frontier.
Thesaurus for outpost from the Collins English Thesaurus
a position stationed at a distance from the area occupied by a major formation