Which City Is Built on a Lagoon: Florence, Venice, or Rome?

The answer is Venice.

Venice (Venezia) is a unique city in northeastern Italy, capital of the Veneto region, constructed on an archipelago of 118 small islands in the Venetian Lagoon. These islands are separated by a network of ~150 canals and connected by over 400 bridges.

Key facts:

• Foundation: Buildings rest on millions of wooden piles (mostly alder) driven into the lagoon's clay bed, petrified by mineral-rich water
• Transport: No cars—vaporetti (water buses), water taxis, gondolas, and walking
• Landmarks: St. Mark's Square, Doge's Palace, Rialto Bridge, Grand Canal
• Threats: Rising sea levels, subsidence, overtourism; MOSE flood barrier system operational since 2020

Florence (Firenze) is inland in Tuscany, on the Arno River. Rome (Roma) is inland on the Tiber River, ~25 km from the Tyrrhenian Sea. Neither is built on a lagoon.