Venetian Lagoon

The Venetian Lagoon covers an area of approximately 550 square kilometers along the Adriatic Sea in northeastern Italy, making it the largest wetland in the Mediterranean basin. Much of this area consists of shallow water, mudflats, and tidal salt marshes rather than navigable channels, with the city of Venice built across a dispersed archipelago within it.

The lagoon has a brackish hydrology, meaning the water is a mixture of fresh water flowing in from rivers and salt water entering from the Adriatic Sea through tidal inlets. This unique salinity gradient supports specialized ecosystems of salt marshes, mudflats, and tidal channels that differ from both fully marine and freshwater environments.

Barene are the characteristic salt marshes of the Venetian Lagoon, consisting of vegetated muddy surfaces that emerge above the waterline during low tide. These marshes are ecologically important habitats for birdlife and aquatic species and also serve as natural buffers that help protect Venice from wave action and the effects of acqua alta flooding.

The lagoon is sheltered from the open Adriatic by a chain of barrier islands, most notably the Lido, Pellestrina, and Cavallino-Treporte. These long, narrow islands are interrupted by three inlets — the Lido, Malamocco, and Chioggia — through which tidal water flows in and out of the lagoon.