Kvarner Gulf
Istria ( ; Croatian, Slovene: "Istra"; Istriot: "Eîstria"; , ; , ), formerly "Histria" (Latin), "Ἴστρια" (Ancient Greek), is the largest peninsula within the Adriatic Sea. The peninsula is located at the head of the Adriatic between the Gulf of Trieste and the Kvarner Gulf. It is shared by three countries: Croatia, Slovenia, and Italy. Croatia encapsulates most of the Istrian peninsula with its Istria County ("Istarska županija" in Croatian, "Regione istriana" in Italian).