Port wine be labelled as "port" or "Porto". In the United States, wines labelled "port" may come from anywhere in the world, while the names "Oporto", "Porto", and "Vinho do Porto" have been recognized as foreign, non-generic names for port wines originating in Portugal. Port is produced from grapes grown and processed in the demarcated Douro region. The wine produced is then fortified by the addition of a neutral grape spirit known as aguardente in order to stop the fermentation, leaving residual sugar in the wine, and to boost the alcohol content. The fortification spirit is sometimes referred to as brandy but
Palm wine content, mildly intoxicating and sweet. The wine may be allowed to ferment longer, up to a day, to yield a stronger, more sour and acidic taste, which some people prefer. Longer fermentation produces vinegar instead of stronger wine. Palm wine may be distilled to create a stronger drink, which goes by different names depending on the region (e.g., "arrack", "village gin", "charayam", and "country whiskey"). Throughout Nigeria, this is commonly called "ogogoro". In some parts in Cameroon it is known as "Afofo". In parts of southern Ghana distilled palm wine is called "akpeteshi" or "burukutu". In Togo and Benin it