Istria
Italy
Istria (IST-ree-ə) is the largest peninsula within the Adriatic Sea. Located at the top of the Adriatic between the Gulf of Trieste and the Kvarner Gulf, the peninsula is shared by three countries: Croatia, Slovenia, and Italy, 90% of its area being part of Croatia. Most of Croatian Istria is part of Istria County.
Data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).