Slovenian name for the special, iron-containing soil type Terra Rossa, This is available in the Kras wine region in the Slovenian region Primorska as well as in the adjacent Italian DOC area Carso in the Friuli-Venezia Giulia region as a coherent area. Both the Serbo-Croatian Kras (Eng. "Thin soil") and the Italian Carso mean "Karst" and the names refer to the large, south-eastern European highlands (see below soil type in the section "Karst"). The special soil occurs there only as a small area northeast of Trieste. The Slovenian-Italian border runs right through this area. In Slovenia, the red wine is grown exclusively on this soil Kras Teran produced.
The much smaller Italian part covers just under 15 hectares within the DOC area Carso, Only the wines grown on the Terra Rosso soil are allowed to look here according to the type of grape used Terrano name (the Terrano and Refošk varieties are identical). All others may only be marketed as Refosco. It is worth noting that the Italian side is also mostly inhabited by Slovenian winegrowers, the current border was not drawn until 1954. In 1986 a 15 km long wine route with 18 restaurants was opened, which leads through the picturesque karst landscape. Also in Croatia a red wine is made from Refošk (Terrano), which used to be called “Istarski Teran” and today mostly only “Teran”.