Slovenian name for the special, iron-containing type of soil Terra Rossa, This can be found in the wine region Kras 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 ("thin soil") and the Italian Carso mean "karst" and the names refer to the large, southeastern European Kalkhochland (see below) soil type in the section "Karst"). The special soil occurs there but only as a small area northeast of Trieste. In the middle of this area runs the Slovenian-Italian border. In Slovenia, the red wine grown exclusively on this soil is called 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 here according to the grape variety used Terrano name (the varieties Terrano and Refošk are identical). All others may only be marketed as Refosco. It is worth mentioning that the Italian side is mainly inhabited by Slovenian winegrowers, the current demarcation was not until 1954. In 1986, a 15-kilometer wine route with 18 restaurants was opened, which leads through the middle of the picturesque karst landscape. Also in Croatia a red wine from Refošk (Terrano) is obtained, which used to be called "Istarski Teran" and today mostly only "Teran".