Oslavia, just past Gorizia, is the reference point for the orange-wine style that Istria's own Roxanich and Clai draw on, a natural pairing day trip for visitors tasting Istria's macerated whites.
Tip: Book Gravner and Radikon separately and well ahead, both cellars run small-group visits only.
The limestone Carso plateau above Trieste grows Vitovska and Malvasia Istriana on the same karst geology that continues into northern Istria, a short cross-border run from Buje.
Pours: Carso Vitovska, Carso Malvasia Istriana
Tip: Pair a Carso cellar visit with lunch in Trieste's old town before the border drive back.
Slovenia's Brda hills roll directly across the border from Momjan and the Bujstina, Rebula and orange-leaning whites from family cellars on the same ridge system as Istria's own hills.
Pours: Brda Rebula, Brda Sauvignonasse
Tip: Check winery opening hours before crossing, several Brda cellars close for a midday break.
The Collio hills around Cormons sit about an hour from Buje across the Italian border, white-wine cellars on ponca soil a world away from Istria's red terra rossa.
Pours: Collio Friulano, Collio Sauvignon, Collio Ribolla Gialla
Tip: Cross before mid-morning, the Cormons cellars keep appointment-based hours similar to Istria's own wineries.
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