High Quality Content by WIKIPEDIA articles! Souzão (or Sousão or Vinhão) is Portuguese wine grape that is used in the production of port wine. While originating in the Minho regions, it is used primarily in Australia, California and South Africa. In Portugal, it is also an authorized planting in the Douro, and Dão-Lafões area (Vinho do Dão). The grape is known for the deep color it produces in a wine as well as its coarse and raisiny taste.. In Australia Souzao is used to make port style wines and also table wines, often blended with other Portuguese grape varieties.