The Tanaro river is a very significant river. It is the largest right-side tributary of the Po, in terms of length. Is significance, in viticultural terms, instead, as it forms the boundary line between the two major viticultural areas around the city of Alba.
On the right, or eastern, bank of the river, known as the Langhe, the calcareous and tufaceous soil provide an ideal terrain for the great Nebbiolo grape and for the world-famous wines which utilize it.
The western side is known as the Roero, and its sandy soils, although planted to vines as well, was principally a zone of fruit trees and vegetable gardens, famous for its strawberries, peaches, and apricots rather than for wine.