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Red wines, though far less common here, can be quite good, especially when made from the deeply colored, rustic Refosco variety. In Collio Goriziano, which abutts Slovenia, many of the same varieties are planted. International varieties like Merlot, Cabernet Sauvignon, and Cabernet Franc are also common, but they tend to be Loire-like in style with herbaceous character and mellow tannins.

Carso’s star grape is the red Teranno, notable for being rich in iron content and historically consumed for health purposes. It has an earthy, meaty profile and is often confused with the distinct variety Refosco.