1. A border between two territories that is clearly defined, indicated by visible markers, or officially established
The marked border between the two countries is indicated by a fence and signage.
A fronteira demarcada entre os dois países é indicada por uma cerca e placas.
2. In design or cartography, a perimeter that has been clearly outlined or delineated
The map shows a marked border around the designated area.
O mapa mostra uma fronteira demarcada ao redor da área designada.