The most famous port wine is the Royal Oporto, which is produced by the company Real Companhia Velha. Real Companhia Velha is not only a worldwide renowned port wine house but also the oldest company in Portugal. The grapes for the production are grown on slate and granite slopes in the valley of the famous Rio Douro (Duoro Valley). After the grapes are harvested by hand and then pressed, they mature for at least 3 years in oak barrels.Tasting notes:Dark red in the glass. In the nose of ripe fruit and a touch of dry wood. On the palate it has hints of nuts, vanilla, fruit jam and fine oak. Grape varieties: Tinta Roriz, Touriga Franca and Touriga Nacional. Aging: oak barrel. Residual sugar: 102 g/l. Acidity: 4.06 g/l.