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
Vinho Verde Verde DOC is divided into nine subregions, which may be indicated on the wine label together with the name of Vinho Verde, for example as Vinho Verde-Amarante. The subregions are: Amarante, Ave, Baião, Basto, Cávado, Lima, Monção e Melgaço, Paiva, and Sousa. The grape varieties recommended or permitted for the DOC are as follows: The two most successful white wine varieties are Alvarinho and Loureiro. Alvarinho tends to produce low yields and can reach much higher alcohol levels. The grape is widely planted in the northern Minho between the Lima Valley and Spanish border. Loureiro produces higher yields but very