All the territory of Portugal was settled by moors, but they were for a longer time in the southern region. If I recall correctly by the time Portugal didn't exist as a country, it was a province of a big Iberian kingdom, as always it was the parasitic Jews infiltrated in Iberia that deceived Iberian peoples into fighting with each other, meanwhile they were making deals with the moors(Berbers) and Arabs to invade Iberia, when the moor army landed in Iberia it was the Jews who opened the gates of the cities so they could enter, otherwise the Moorish army wouldn't have been able to siege all the Iberian cities they took, and much less defeat the bigger Iberian armies.    The moors that settled were few basically the cities were controlled by an elite of Jews and Moors, and during the reconquest most fled or were killed.