Cannubi is the long, gradually rising hill in the centre of the Barolo area. Here, Serravallian and Tortonian soils meet and merge, creating bluish-gray marls rich in magnesium and manganese carbonates that take on a whitish-gray hue at the surface due to weathering: clays mixed with very fine sands, impregnated with a strong limestone content composed of magnesium and manganese carbonates. Their technical name is “Sant’Agata fossil marls”, but they are commonly called Toû and on average they comprise clays (55%), sands (30%) and limestone (15%). Surrounded by higher hills that protect it from bad weather and excessive flow of air, Cannubi enjoys a very special, unique microclimate.