MS Theory — Wine Regions of Spain & Portugal

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Spain and Portugal together represent the most undervalued depth in the MS theory exam. Spain alone contains over 600 indigenous grape varieties and 70+ DO/DOCa designations spanning ecosystems from the Atlantic-influenced Rías Baixas to the arid meseta of Ribera del Duero to the volcanic Canary Islands. Portugal, despite its small size, produces fortified wines (Port, Madeira) that every Master Sommelier must know in encyclopaedic detail, as well as a diverse array of unfortified wines built on indigenous varieties — Touriga Nacional, Baga, Alvarinho — that appear in the MS tasting exam with increasing frequency. The key intellectual distinction for Iberia: Spain and Portugal both operate classification systems that reward ageing time rather than site quality, unlike France's terroir-based hierarchy. Rioja crianza/reserva/gran reserva and Port ruby/tawny/vintage/colheita classifications are legal ageing designations, not quality tiers — though in practice ageing time and quality correlate. Understanding both systems fluently is an MS requirement.

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