Province of Trieste
Italy lost Istria: the provinces of Fiume, Zara, and most of Gorizia and Pola were ceded to Yugoslavia; the rest of Istria and the province of Trieste formed a new sovereign State (Free Territory of Trieste) divided in two administrative zones under a provisional government for which the United Nations Security Council was responsible. In 1954, Italy incorporated the Province of Trieste (Zone A) and Yugoslavia incorporated the rest of Istria (Zone B). This was officially recognized with the Treaty of Osimo in 1975.