Geography and Soils
The three sub-zones are all at an elevation of between 500 and 800 m above sea level. Arganda is the largest sub-zone, containing about 50% of the vines and comprising 26 municipalities. The soil here contains mainly clay and lime over a granite subsoil. To the southwest, close to the Sierra de Gredos range, is the San Martín sub-zone, which contains 35% of the DO's vines. Further to the southwest is the Navalcarnero sub-zone with 15% of the vines. Rich dark soils are more abundant in San Martín, while in Navalcarnero the soils lack carbonates, are low in nutrients, and lie over a clay subsoil.
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“The totality of our so-called knowledge or beliefs, from the most casual matters of geography and history to the profoundest laws of atomic physics or even of pure mathematics and logic, is a man-made fabric which impinges on experience only along the edges. Or, to change the figure, total science is like a field of force whose boundary conditions are experience.”
—Willard Van Orman Quine (b. 1908)
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