What are the three key wine regions of Southern Portugal?

The three key wine regions of Southern Portugal highlighted in the correct choice are significant for several reasons. The IGP Peninsula de Setúbal, Alentejo DOC, and IGP Alentejano represent both distinct geographic areas and a variety of wine styles that define this part of Portugal.

IGP Peninsula de Setúbal is known for its diverse range of wines, particularly the rich, sweet Muscat wines which are a hallmark of this region. The proximity to the Atlantic Ocean also influences the climate, allowing for a unique expression of the grapes grown here.

Alentejo DOC is perhaps the most renowned of Southern Portugal's regions. It produces a wide range of wines, both red and white, and is known for its warm climate that favors the ripening of a variety of grape types, including indigenous varieties as well as international ones. The region's wines are characterized by their fullness and accessibility, making them popular both locally and internationally.

IGP Alentejano encompasses a broader area with less stringent regulations compared to DOC status, allowing for more flexibility in wine production. This leads to a wide array of wine styles being produced, catering to different tastes and markets.

Together, these regions underline the diversity and quality of wines produced in Southern Portugal,