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When refugees from the mainland began settling the marshy islands of the Venetian Lagoon in the 5th century, fleeing successive invasions, the canals were simply the naturally occurring inlets and channels between those islands. Buildings were raised on pilings -- closely spaced tree trunks driven deep into the sand and clay beneath the mud, later famously sourced from forests as far away as Slovenia -- and capped with water-resistant Istrian limestone to carry the stone and brick structures above.
As Venice grew into a major maritime power, the Republic of Venice formalized management of its lagoon and canals through the Magistrato alle Acque (Water Authority), established in 1501 -- one of the world's earliest dedicated water-management institutions, tasked with keeping the channels navigable and the city itself from washing away. The catastrophic flood of November 1966, which submerged much of the city and destroyed countless artworks, became the turning point that made flood control a matter of international concern rather than a purely local one, eventually leading to the MOSE barrier system -- decades under construction before its gates first successfully held back the sea in 2020.
No single figure built Venice's canals -- they emerged from centuries of incremental engineering by the Republic's own institutions. The Magistrato alle Acque's officials, largely anonymous to history, nonetheless shaped the canal network more directly than any doge: their dredging and building regulations are why the city's waterways still function at all.
The gondola, once the everyday transport of Venetians of every class, gradually gave way to the vaporetto and water taxi for practical travel and became instead a ceremonial, romantic symbol aimed largely at visitors. Acqua alta (high water) flooding, a recurring seasonal fact of Venetian life, produced its own civic culture -- raised wooden walkways (passerelle) still appear through flooded squares each autumn and winter. The grand palazzi lining the Grand Canal were themselves a form of cultural expression, merchant families competing to display their wealth directly onto the water for every passing boat to see.
Venice continues to sink slowly while sea levels rise, making the canals both the city's defining feature and its central vulnerability. Large cruise ships were banned from the Giudecca Canal in 2021 after years of debate over their wake and pollution, and the city introduced an entry fee for day-trippers in 2024 -- both direct responses to pressures the canals themselves make impossible to ignore. For residents, though, they remain what they have always been: the city's actual streets.