The production zone is formed by hills reaching altitudes exceeding 400 metres above the surrounding northern Asti area.
The soils rest on Miocene marls of Langhian–Burdigalian age and display a pale colour with a medium-textured composition.
The north-western area of Monferrato borders the Turin hills, which are of an entirely different geological origin, being of morainic type.
The grape production zone encompasses the planted vineyard areas within the communes of Albugnano, Castelnuovo don Bosco, Passerano Marmorito, Pino d'Asti, Berzano San Pietro, and Moncucco Torinese. (via Wikipedia · CC BY-SA 4.0)
Human factors
San Giovanni Bosco, the son of winegrowers, contributed to the protection, improvement, and renown of viticulture in the Castelnuovo area and would also appear to have written a popular-science text, subsequently lost, entitled 'L'enologo italiano'.
The traditional training systems prescribed are the counter-trellis with upward-growing vegetation, pruned mainly to Guyot, to arched cane, or to low spur-trained cordon. (via Wikipedia · CC BY-SA 4.0)
Terroir / wine link
Poorly exposed or excessively steep slopes are left under woodland, which helps to moderate summer heat within the production zone.
Facts drawn from the specification's terroir-link section by automatic interpretation — see the source.
About this boundary
Area: the official production zone published by the regional geoportal (Piemonte).