The wide plain ending on the Adriatic Sea and the river Po has been formed by the floods of alpine and prealpine watercourses and includes vast conoids and terraced-surfaces, as well as the active portion (alvei) of the same courses. This area includes the surface of the valley bottom of the main alpine rivers (Adige, Brenta, Piave, Tagliamento and Isonzo) as well as some important flowing rivers. These territories (with a relatively recent origin) were formed by the deposition both of limestone and coarse material, gravel and sand, have today medium-to very high depths with generally good drainage and general skeleton content always present.
The hilly system stretches from Garda to Collio and has some isolated reliefs which the most important for wine production are the Berici and the Euganean (Volcanic) Hills. The presence of marnous or calcareous soils with conglomerates such as the presence of karst phenomena is here significant.
The plains, from the Padano-Venetian to the Friulian and high-Friulian ones, were formed thanks to the solid springs of the main alpine rivers such as Po, Adige, Brenta, Piave, Tagliamento and Isonzo. Distinctive feature is the strong classification of sediments in the early parts while secondary soils are predominantly gravel with sandy matrix with surfaces for most antique deposition.
The climate is characterized by average annual temperatures ranging from 0-12 to 13-14 °C. The colder months, December and January, with temperatures from 1 to 4 °C / -1, -5 °C, alternate with the hottest ones in July and August with an average temperature between 20 and 25 °C. In mountainous areas and bottom valleys, the temperature ranges are lowered by one-two degrees while rainfall rises over the annual average of 700-1300mm, rising from west to east. The rainy months are generally May, October and November during which the pre-Alpine and High Friuli regions also reach 150 mm of rainfall. Generally, thanks to the rainfall benefit and the overall good available water capacity, the soils have no water deficiency problems.