Collio is the guaranteed quality location extending to the northern hills area of the province of Gorizia, near the Slovenian border, it has about 1.400 hectares of specialized vineyards. The lands are made of stratified marlstone and sandstone from ocean origins, which were brought up to surface by the lifting of the seabed in ancient times. These marlstones easily disintegrate under the action of atmospherical agents, which first origin coarse topsoil, then becoming granular, and finally very delicate, making the land ideal for vine-growing after a few seasons. This situation has made vine-growing favourable since ancient times, as the system began taking place before the pre-Roman age and spreading later on during the years of the ancient Roman Empire. Wines became renowned and researched already by ancient European courts, and especially by the Serene Republic, as well as the imperial Hapsburg court which reigned struggling for these lands over a long period of time. Modern vinegrowing starts in Collio during the second-half of the past century, with the introduction of precious varieties of grapes for the production of French and German wine, which replaced some old less important vineyards. An important stage for vine-growing in Collio is represented by the Italian presidential decree passed on May 24, 1968 which recognized these wines with the Guaranteed Quality brand.
Isonzo “Esos“, the god of Trade, is the name of celtic river Isonzo dominating the guaranteed quality area of those wines produced along the region it wets.
The Isonzo guaranteed quality area is composed of a ground zone, of about 1.000 hectares of vine-yards, that extends itself to the south of the hilly area between Karst and Judrio.
Isonzo is actually the major maker of the geological conformation of this land.
It has a well-diversified chemical-physical structure; with a calcareous, permeable and porous land conformation, which perfect for vine-growing, passing to alluvial, gravelly and clayey- muddy lands. The climate is quite uniform thanks to the Alps and the Karst which do not allow the penetration of cold winds and the mitigatory action of the sea.
The vine-growing tradition around the guaranteed quality Isonzo area started out with the foundation of Aquileia and the Friulian hinterland colonization.
It is said that the first inhabitants of this countryside, the Venetians, a population who made a living working on the land, imported the vine from Greece, increasing the trade of products grown on their lands.