Nova Gorica (pronounced [ˈnɔʋa ɡɔˈɾitsa]; population: 13,852 (town); 21,082 (incl. suburbs); 31,000 (municipality)) is a town and a municipality in western Slovenia, on the border with Italy. Nova Gorica is a new town, built after 1948 when the Paris Peace Treaty established a new border between Yugoslavia and Italy, leaving nearby Gorizia outside the borders of Yugoslavia, thus cutting off the Soča Valley, Vipava Valley, and the northwestern Karst Plateau from their traditional regional centre. Nova Gorica is the principal urban centre of the traditional region of Goriška in the Slovenian Littoral.