A fort built in the 17th century, within the scope of the War of Restoration, in earth and stone, with a roughly square plan, composed of bastions arranged at angles, overlapped to the south by sub-circular bastions, with external walls in slope, surrounded by a ditch and with the door protected by elongating walls. The fort is part of a defense structure of the Portela do Extremo that included the Forte da Pereira border.