Porto or Port Wine is a fine wine with a great tradition. It is made from a variety of grapes cultivated in the Douro River Valley of Portugal. At a specific moment in the fermentation process, the wine is transferred to vats where grape brandy is added. The brandy, called aguardente, halts the fermentation process, which ensures that some of the grape sugar is retained and at the same time, fortifies the wine. Port is blend of wines from different estates (quintas). Although the Port is actually made in the Douro region, it is transferred to cellars in Vila Nova de Gaia, across the river from Porto, for the maturation process. Recently, the Portuguese wine industry has renamed Port wine "Porto" to reflect its authenticity and the name of the city from which it is shipped.