Question: what are the strongest wines?
Answer: Shiraz ~15.5% ABV (Australia)
Grenache-Syrah-Mourvèdre 15.5% ABV (California and Australia)
Zinfandel up to 16% ABV (California)
Late Harvest Dessert Wine 15–17% ABV.
Sherry 15–20% ABV (Spain)
Port and Tawny Port ~20% ABV (Portugal)
Banyuls and Maury ~20% ABV (France)
Madeira ~20% ABV (Portugal)