DO area (banks of the Guadiana) in the Spanish region of Extremadura directly on the border with Portugal. It was named after the river Guadiana, which flows through the wine-growing area in a westerly direction. The area extends mainly in the southern half, Extremadura Baja. The area, which comprises around 22,000 hectares of vineyards, was formed in 1999 from six former Land Wine Areas (VT). These are Cañamero in the north-east (5 municipalities), Matanegra in the very south (8), Montánchez in the centre (27), Ribera Alta in the central east (38), Ribera Baja in the central west (11) and Tierra de Barros in the south-east (36)
Despite its large extension of more than 100 kilometres, the climate is homogeneous, with hot, dry summers and moderate winters. There are partly quite different soil types. In Cañamero and Montánchez there are poor slate soils, in Ribera Alta sandy soils and in Matanegra, Ribera Alta and Ribera Baja swampland soils. The largest and considered the best area Tierra de Barros (Land of Clay) was already approved as a temporary DO since 1979. It has fertile, nutrient-rich clay soils at an altitude of around 500 metres above sea level. Due to east winds, the climate here is extremely hot and dry.