Porto Torres is a comune and a city of the Province of Sassari in north-west of Sardinia, Italy. Founded during the 1st century BC as Colonia Iulia Turris Libisonis, it was the first Roman colony of the entire island. It is situated on the coast at about 25 kilometres east of Falcone Cape and in the center of the Gulf of Asinara. The port of Porto Torres is the second biggest seaport of the island, followed by the port of Olbia.