Over the years, constructions began to fully fortify the fortress hill. The pentagonal system began at the farthest point of the cape near south east of the river mouth, towards the west of the Fortaleza. At this point two ramparts were built at right angles to each other lining the shores. The one running northward toward the river mouth was 130 fathoms in length to the bastion of São Pedro while the other one ran for 75 fathoms to the east, curving inshore, ending at the gate and bastion of Santiago.