So called because it has no tributaries and emissaries, Dead Lake is an intravalley lake formed through landslide accumulations that occurred at the end of the ice age. With its 55 m depth, and a reservoir of approximately 20 million square meters of water, it is the largest of the three lakes in the municipality of Vittorio Veneto. It is fed by underground infiltrations that come from Lake Santa Croce and by karst springs from the right side of Col Visentin. Like the underlying Restello and Negrisiola, arranged in succession, these semi-artificial basins were "built" on ancient basins left by the glacier that descended from the Lapisina Valley and in which mirrors of lake water had taken place. In fact, Val Lapisina is what remains of the branch of an ancient glacier that followed the current course of the Piave. The branch, in turn, divided, forming on one side what is today the Valley and on the other the morainic amphitheater located between Vittorio Veneto and Conegliano.