In Madeira Island, vineyards are grown in small earthen enclosures, known as "poios", supported by earth walls on the mountain slopes, which are often difficult to access. The unique soil and climate of Madeira Island, as well as the production process and grape varieties cultivated, have contributed to the unrivalled distinction of Madeira Wine over the ages.
Thirty grape varieties are used for the production of this fortified wine, the noblest being Sercial, Boal, Verdelho and Malvasia.
