Which fortified wine comes from the Douro Valley in Portugal?

The fortified wine from Portugal’s Douro Valley is Port wine.

Port, also called port wine, is produced in northern Portugal from grapes grown in the demarcated Douro wine region. During production, winemakers add aguardente, a neutral grape spirit, to stop fermentation. This preserves some natural grape sugar while raising the alcohol level, typically to roughly 19–22% by volume.

Port became especially important in the English wine trade during the late 17th and early 18th centuries. Fortification helped the wine survive long sea voyages, and the Methuen Treaty of 1703 encouraged Portuguese wine imports into England. The wine takes its English name from Porto, the seaport at the mouth of the Douro River.

Port is not limited to sweet red dessert wine. Ruby, tawny, white, rosé, and dry styles exist, with different aging methods and flavor profiles. Sherry comes from the Jerez region of Spain, Madeira from Portugal’s Madeira Islands, and Marsala from Sicily, so they are related fortified wines but not correct answers to this question. Under protected-designation rules, “Port” specifically refers to Portuguese production.