Final answer:
Terrantez is a grape variety used in Madeira to make fortified wines known for their complex flavors and aging potential.
Step-by-step explanation:
The grape variety Terrantez is a lesser-known variety that is specifically associated with the island of Madeira, where it is used to create the region's renowned fortified wines. This variety contributes to the complex and distinctive flavors of Madeiran fortified wines, which are highly valued for their aging potential and unique taste profile, resulting from the island's volcanic soil and subtropical climate.