From The Food Encyclopedia by Jacques Rolland and Carol Sherman
A wine with grape brandy added before the fermentation is complete, more complex than other fortified wines. Port falls into two categories: wood-aged and bottle-aged. Wood- or cask-aged ports, which mature in wood casks and are then bottled, include Ruby, Vintage Character, Late-Bottled Vintage, Tawny, Colheita and White varieties. White is popular in Europe, but rarely found in the U.S. Bottle-aged ports, which spend only a brief period of time in barrels and do most of their maturing in the bottle, include Vintage (the finest), Single-Quinta and Crusted varieties. Port is made only in Portugal, in the Douro River Valley. The area was officially demarcated by the Portuguese in the 18th century.
