Nova Gorica is a town in western Slovenia, on the border with Italy. It is the seat of the Municipality of Nova Gorica. Nova Gorica is a planned town, built according to the principles of modernist architecture after 1947, when the Paris Peace Treaty established a new border between Yugoslavia and Italy, leaving nearby Gorizia outside the borders of Yugoslavia and thus cutting off the Soča Valley, the Vipava Valley, the Gorizia Hills and the northwestern Karst Plateau from their traditional regional urban centre. Since 1948, Nova Gorica has replaced Gorizia as the principal urban center of the Gorizia region, as the northern part of the Slovenian Littoral has been traditionally called.

Gorizia, colloquially stara Gorica 'old Gorizia' to distinguish it from Nova Gorica, is a town and comune (municipality) in northeastern Italy, in the autonomous region of Friuli-Venezia Giulia. It is located at the foot of the Julian Alps, bordering Slovenia. It is the capital of the Regional decentralization entity of Gorizia and is a local center of tourism, industry, and commerce. Since 1947, a twin town of Nova Gorica has developed on the other side of the modern-day Italy–Slovenia border. The region was subject to territorial dispute between Italy and Yugoslavia after World War II: after the new boundaries were established in 1947 and the old town was left to Italy, Nova Gorica was built on the Yugoslav side. The two towns constitute a conurbation, which also includes the Slovenian municipality of Šempeter-Vrtojba. Since May 2011, these three towns have been joined in a common trans-border metropolitan zone, administered by a joint administration board.