Port wine is a Portuguese fortified wine from the Douro Valley in the northern provinces of Portugal. Produced from grapes grown and processed in the demarcated Douro region, the wine is fortified with the additoin of Brandy to stop the fermentaiton, leaving residual sugar in the wine. All varieties of Port have rich, intense, and very persistent aromas and flavour, with high alcohol content (usually between 19% and 22% vol.). They exist in a variety of sweetness and colours.