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Daily Pic: 

A view of the Tyrrhenian Sea from a fishing wharf in the town of Fiumicino, Italy, about 5 min drive from Rome's Leonardo da Vinci Fiumicino Airport.

Fiumicino, which stands for little river in Italian, is called after the right distributary channel of the Tiber, passing through. The town itself is located approximately at the same location where Portus, a large artificial harbor of Ancient Rome, was located. Note that today the main sea port serving Rome and all of central Italy is Civitavecchia, about 80 km north-west of Rome.

Virgil, in his Aeneid, would make you believe that if you squint, you could see Carthage from Portus:

    Against the Tiber's mouth, but far away,
    An ancient town was seated on the sea;
    A Tyrian colony; the people made
    Stout for the war, and studious of their trade:
    Carthage the name;

In reality Tunis is about 300 nautical miles (580 km) from Fiumicino - the furthest you can see, standing on a shore, is less than 5 km (3 miles) due to the Earth's curvature. The ancient Roman warships would cover that distance in about 2-4 days, depending on the winds, using the assumption of the sustained speed of 4-6 knots with the wind and 2-2.5 knots against it. You can easily verify it using AXSMarine calculator (register and use Fiumicino and La Goulette as ports names), or the following great article on the Speed under sail of ancient ships. In case you are wondering just how far we progressed in 2000 years, today's warships have a top speed of about 30 knots (56 km/h).

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