There used to be a small lagoon, the lagoon of Brondolo, south of the Lagoon of Venice and close to Brondolo, to its southeast. The two lagoons were connected by the Brondolo inlet. The Republic of Venice carried out a number of southwards diversions of the river Brenta, which was causing silting in the central area of the Lagoon of Venice. In one of these it was taken to flow into another part of the lagoon, in the Val di Brenta basin, on its shore opposite Chioggia, with the creation of a canal called Brenta Nova, which was completed in 1507. Then the Venetians built the Parador di Brondolo, an embankment, to cut this river off the Lagoon of Venice and to separate this lagoon form the Lagoon of Brondolo. It was taken to the Brondolo inlet and made to flow into the latter lagoon. This was completed in 1577. Since this lagoon was closed off from the sea, it was turned into a freshwater coastal lake in a couple of centuries due to the river bringing in freshwater. Later this lagoon silted as the river brought in its sediments.