Of the 156 fortresses, 48 were located within Mafra municipality, and represented the second line of defence including sites in Malveira, Gradil, Ribamar, Carvoeira, Mafra and Ericeira.
Das 156 fortalezas, 48 estavam situadas no município de Mafra e representavam a segunda linha de defesa, incluindo locais em Malveira, Gradil, Ribamar, Carvoeira, Mafra e Ericeira.