The OUTER PORT is between the mainland to the south, the Pedagne island to the east, the island of S.Andrea to the west and the imposing Punta Riso dam to the north. The whole surface covers 3 million square metres.

The MID PORT is made of the sheet of water before the channel leading to the port (Pigonati channel) and covers a surface of 1.200.000 square metres.

Last but non least the INNER PORT, made of the natural inlets - seno di Levante and seno di Ponente -, penetrates the town, covering a surface of 727.000 square metres.