The Saline di Margherita di Savoia are salt marshes located right in front of the Tower. But before discussing them, there is another aspect that needs to be highlighted.

We are in a system of alluvial plains, surrounded by the Daunian Subapennines to the west, the Gargano promontory and the Fortòre River to the north, the Adriatic Sea to the east, and the Òfanto River to the south.

In this area, there are also other rivers - the Carapelle, the Cervaro, the Candelaro - all of Tórrential character. In other words, they have highly variable flow rates and irregular courses. Incidentally, even the Òfanto River has got character. The Roman poet Horace in the first century BC, in his Satires, calls it Aufidus Acer, the violent Ofanto.

All of these rivers, besides being unpredictable by nature, are also filled with moving debris. This is because the Apennine heights are subject to continuous erosion. Over time, the debris advances the coastline, to the extent that the ancient settlements of Sàlpi and Siponto, once on the sea, are now located inland.

The material transported by the rivers has also contributed to the formation of a system of beaches and dunes that, in many cases, prevented the watercourses from reaching the sea. This explains the creation of a complex system of lagoons and wetlands.

Starting from the 18th century, the inhabitants began cultivating the sandy lands near the coast. Easily tilled, they became irrigated vegetable gardens of narrow and elongated shape. These are the "arenili," dedicated to intensive vegetable cultivation, which the farmers protected from the wind by planting marsh plants.

The attempt to control the marshes, on the other hand, is a game played over millennia.