Ribera del Duero runs along the Duero across the northern plateau of Castile and León, most of it between 750 and 900 metres. Altitude shapes everything here. Summer days are fierce and the nights fall away sharply, so grapes ripen fully while holding on to acidity, and the growing season is short enough that frost at either end is a real risk. The land is flat and stony, with limestone outcrops breaking through near Peñafiel and Roa de Duero, where the most prized vineyards sit.

Tempranillo, known locally as Tinto Fino or Tinta del País, accounts for almost all the planting and gives wines that are darker, firmer and more structured than its Rioja counterpart. The region built its reputation on a single estate, Vega Sicilia, long before the denomination existed, and the rush of new wineries since the 1980s has turned it into Spain's most closely watched red wine region after Rioja.