On the Portuguese side of the border there are even more fortifications than in Spain. Almeida is found in the north of Portugal. It is a star fort with 12 corners, Vauban style, built in 1641. The Spanish only entered here once in all their history, and then with the help of the French. The square is an irregular quadrilateral and is not positioned quite geometrically, just as the star is not perfect, but its role as a centre is obvious when related to the margins of the citadel.