The grapes used in port are grown along the Douro river valley in northern Portugal. The most common grapes used to make port include: ~Touriga Franca – dark, high tannin fruit with blackberry flavors ~Touriga Nacional – a deep purple grape with notes of tar and chocolate ~Tinta Roriz – the most common grape used, with flavors of blackberry and cola ~Tinto Cão/ Tinta Cao – similar berry flavors ~Tinta Barroca – low tannin, strawberry notes Of these grapes, Touriga Nacional is the most sought after.