Development
The Lagoon of Venice is the most important survivor of a system of estuarine lagoons that in Roman times extended from Ravenna north to Trieste. In the sixth century, the Lagoon gave security to Romanised people fleeing invaders (mostly the Huns). Later, it provided naturally protected conditions for the growth of the Venetian Republic and its maritime empire. It still provides a base for a seaport, the Venetian Arsenal, and for fishing, as well as a limited amount of hunting and the newer industry of fish farming.
The Lagoon was formed about six to seven thousand years ago, when the marine transgression following the Ice Age flooded the upper Adriatic coastal plain. Deposition of river sediments compensated for the sinking coastal plain, and coastwise drift from the mouth of the Po tended to close tidal inlets with sand bars.
The present aspect of the Lagoon is due to human intervention. In the fifteenth and sixteenth centuries, Venetian hydraulic projects to prevent the lagoon from turning into a marsh reversed the natural evolution of the Lagoon. Pumping of aquifers since the nineteenth century has increased subsidence. Originally many of the Lagoon’s islands were marshy, but a gradual programme of drainage rendered them habitable. Many of the smaller islands are entirely artificial, while some areas around the seaport of the Mestre are also reclaimed islands. The remaining islands are essentially dunes, including those of the coastal strip (Lido, Pellestrina and Treporti).
Venice Lagoon was inhabited from the most ancient times, but it was only during and after the fall of the Roman Empire in the West that many people, coming from the Venetian mainland, settled in a number large enough to found the city of Venice. Today, the main cities inside the lagoon are Venice (at the centre of it) and Chioggia (at the southern inlet); Lido di Venezia and Pellestrina are inhabited as well, but they are part of Venice. However, the most part of the inhabitants of Venice, as well as its economic core, its airport and its harbor, stand on the western border of the lagoon, around the former towns of Mestre and Marghera. At the northern end of the lagoon, there is the town of Jesolo, a famous sea resort; and the town of Cavallino-Treporti.
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