Which grape variety is unique to the Bairrada region?

Baga is indeed a grape variety that is considered unique to the Bairrada region of Portugal. This grape is primarily grown in this area and is known for its high acidity and tannin structure, which allows it to produce wines that are capable of aging well. Baga is often used to make both red wines and sparkling wines in Bairrada, showcasing the region's terroir and winemaking traditions. The connection between Baga and Bairrada is particularly strong, as the grape thrives in the limestock-rich soils and the temperate climate found there, contributing to the distinct characteristics of the wines produced from it.

While the other grape varieties listed may be associated with various regions in Portugal, Baga's strong association with Bairrada helps to define the region's identity and reputation in the wine world.