In the first century A.D. the Emperor Claudius ordered the design of a new port centre for Rome and the realization of this huge project took about twenty years of hard work. The large mooring harbour was extensive but shallow and soon began to silt up. To rectify this the Emperor Claudius around the year 100 created a new artificial dock dug deeper into the coast. This had a hexagonal shape, with sides of 335 meters and the lake that was formed is still visible from all of the air passengers. The area of the two ports has become part of an archaeological park and the surrounding area is a private naturalist oasis that can be visited (Oasi di Porto).