Sicily and Sardinia are amazing wine regions, but with very different personalities.
Map Resources
Wine Enthusiast: Beginner’s Guide to the Wines of Sicily (with maps)
The Wine Depository: Wine map of Sicily (within article)
DeLong, the best wine map company around, offers a free download of their Sicily map: https://www.delongwine.com/products/wine-map-of-sicily-digital-edition
Vineyards.com: Sardinia Wine Map
Vinity Wine Company: Sardinia (with map)
Sicily
Main grapes: Grillo, Cataratto, Nero d’Avola, Nerello Mascalese
Winesearcher: Sicily
Eataly: Discover the wines of Mount Etna
Food and Wine: Sicilian Wines from Mount Etna
Sardinia
Main grapes: Cannonau, Vermentino
Winesearcher: Sardinia
Wikipedia: Sardo (language)
Blue Zones: Sardinia, Italy
Wine Enthusiast: A Wine Lover’s Guide to Sardinia