Port wine is made in the Northern part of Portugal along the Douro river. These rare sweet red wines are made with dozens of Portuguese traditional grapes including Touriga Nacional, Touriga Franca, and Tinta Roriz. The grapes are collected and fermented together in open tanks where the grapes are stomped daily as the wine begins to ferment.
At a point during the fermentation, the wine is strained and blended with a clear grape spirit (with nearly 70% ABV) that stops fermentation and fortifies the wine. After this process, there are a series of winemaking steps that lead into the different styles.