The Altanea valley was in the past a slightly raised area, crossed by sand dunes, behind which ran the old course of the river Livenza which mouth was south west of the valley itself (now the mouth is located in the nearby Porto Santa Margherita ).
The area was never very anthropized as the whole territory behind the coast (Pinetus Maior and Minor Pinetus), the ancient lagoon, was transformed over the centuries, thanks to the contribution of rivers, in alluvial soils and unhealthy swamp.
There were however people living in that areas over time as evidenced by James Filiasi in the book "Historical Memories of Veneti First And Seconds" of year 1797: "... in that time, we saw many ruins around the Caorle shores, and this was the end of the fifteenth century. They say it is still possible to find traces at Lido Altanea,... ".
There was also the port of Bishops of Ceneda (the ancient name of Vittorio Veneto) that built there in the sixteenth century, also a church (made by the Bishop Girolamo Righetto). The current extreme boundary of the diocese of Vittorio Veneto still comes down to the sea where once stood its port in the Altanea Valley.
The work of draining the swamp began in these areas just before the First World War, continued between the wars and was completed, thanks to the work of Dr Giorgio Romiati between 1950 and 1965. After the draining of the 500 hectares of Altanea valley, started the initial works of reclamation of the land (1964) and were made the first crops. It was then built a modern center for livestock, breeding cattle for milking, milk cooling and storage of fodder by drying with cold air.
The rehabilitated valleys were populated by peasants from Padua and Treviso, therefore in Caorle (always in traffic, during the Republic of Venice, to and from the Holy Land) people talk a pleasant Venetian, while nearby people speaks a mixture of various Venetian dialects.
Today, where was the valley arose a modern tourist center that offers hotels and holiday homes with swimming pools and wide green spaces and comfortable pedestrian and cycling routes connecting the different structures between them and the beach.