Which region contributes nearly half of Spain's total wine production?

The region that contributes nearly half of Spain's total wine production is Castilla-La Mancha. This expansive region is located in the central part of Spain and is known for its vast vineyard area, which is the largest in Spain and one of the largest in the world. Castilla-La Mancha's climate and various terroirs are well-suited for producing a significant volume of wine, primarily made from grape varieties like Airén for white wines and Tempranillo for reds.

In contrast, regions like Rias Baixas, Jerez, and Priorat are much smaller in scale and focus on producing specific types of wines or varieties, such as the white Albariño in Rias Baixas, sherry in Jerez, and high-quality, often rich and powerful wines in Priorat. While they each hold significant historical and cultural importance in the wine industry, their contributions to the total wine production of Spain are not as substantial as that of Castilla-La Mancha.