Porto Torres' territory is situated on the north-west part of Sardinian Coast, inside the gulf called Gulf of Asinara. The extension of municipality is almost 10200 hectare and is suddivided in two parts with almost the same portion of land. One part is the part where is situated the city, the industry and the romanic ruins, the latter is Asinara island with the smaller Isola Piana. This part of territory is from 1997 a national park. The morphology of ``city part`` is flat, in fact Porto Torres and the rest part of north-west Sardinia is characterized by a Nurra flat, there are some hill formation in the middle of the flat, part of this hill formation is in Porto Torres' territory and the highest elevation of it is Monte Alvaro with it thickness of 342m. Furthermore the land territory is crossed by two rivers, Rio Mannu and Fiume Santo, the first draws the edge of Porto Torres territory on west instead the latter is pretty near the city and was used like a fluvial way from the Roman age.