Which two regions in Navarra DO are known for their red wine production?

The correct answer identifies Navarra DO and Ribera del Duero as the regions known for red wine production. Navarra DO, located in northern Spain, is particularly recognized for its diverse range of red wines, often made primarily from Tempranillo, Garnacha, and other varieties. The region has gained a reputation for both traditional and modern winemaking approaches, producing wines that can be fresh and fruit-forward or complex and age-worthy.

Ribera del Duero, another premium wine region in Spain, is renowned for its high-quality red wines, predominantly made from Tempranillo. The region has a strong emphasis on producing structured and intense wines that reflect its unique terroir, characterized by hot summers and cold winters.

The other options mentioned do not correspond to regions within Navarra DO that are recognized for red wine specifically. Calatayud and Carinena are primarily associated with other wine styles and do not share the same recognition for red wine production in Navarra. Napa Valley is an esteemed American wine region known for various styles, including robust reds, but is not relevant here. Valle de Guadalquivir primarily features other varietals and isn't focused on the production of red wines like Navarra and Ribera del Duero.