Istria County (/ˈɪstriə/; Croatian: Istarska županija; Italian: Regione istriana) is the westernmost county of Croatia which includes the biggest part of the Istrian peninsula (2,820 km² (1,089 sq mi) out of 3,160 km² (1,220 sq mi), 89%). The area of the county is called Istra in Croatian and Slovene.