The Laguna del Mort is a lagoon with sea water, located in the Veneto, along the coast of the northern Adriatic, northeast of the lagoon of Venice. It adjoins the last arm of the mouth of the river Piave. The average depth is about half a meter, the maximum is a maximum of 2 m.
Until October 5, 1935, the Laguna del Mort was nothing but the last section of the river and its mouth. At that time, the river Piave was perpendicular to the coastline to a few hundred meters from the Adriatic Sea. When he reached the village of Cortellazzo, the river turned diagonally to the left and ran about 3 km perpendicular to its origin, in its place it emptied into the Adriatic Sea.
On that day, at the height of a special flood, the Piave broke the right bank just where it turned to the northeast, and immediately plunged into the sea, leaving the old river bed, and sealing off the sand and mud dump the connection between this and the river itself. This last part of the Piave was therefore free of freshwater inflows and was only filled by the rising tide.
Over time, the dead branch of the Piave River has partially buried itself and has become the natural habitat of hundreds of marine and lagoon birds.
This particular context was also favored by the particular state of isolation, which isolates the area around the lagoon from the surrounding countryside, since it is bordered by three watercourses: the Piave River in the southwest, Livenza in the northeast, and the navigable Revedoli Canal in the west ,