Ostia (/ˈɒstiə/, Italian: [ˈɔstja]), officially Lido di Ostia, is a large neighbourhood in the Municipio X of the comune of Rome, Italy, near the ancient port of Rome, which is now a major archaeological site known as Ostia Antica. Ostia is also the only municipio or district of Rome on the Tyrrhenian Sea, and many Romans spend the summer holidays there. It is entirely situated within the municipality of Rome and is the city's seaside resort.
Ostia was the port city of ancient Rome; it had a strategic function for trade, especially for the supply of grain, and as the main base of the Roman navy. It had a fundamental function during the Punic Wars, and after the final destruction of Carthage, and the end of Macedon's independence; by the latter half of the 2nd century BC, Roman control over all of what was later to be dubbed Mare Nostrum ("our sea") had been established.
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