state boundary

English Thesaurus

1. the boundary between two states (noun.location)

hypernym	:	border, borderline, boundary line, delimitation, mete,
definition	:	a line that indicates a boundary (noun.location)

instance hyponym	:	mason and dixon line, mason and dixon's line, mason-dixon line,
definition	:	the boundary between Maryland and Pennsylvania; symbolic dividing line between North and South before the American Civil War (noun.location)