Istria is the largest peninsula in the Adriatic Sea. The peninsula is located at the head of the Adriatic between the Gulf of Trieste and the Bay of Kvarner. It is shared by three countries: Croatia, Slovenia and Italy.
The division of Istria between Croatia and Slovenia runs on the former republic borders, which were not precisely defined in the former Yugoslavia. Various bones of contention remain unresolved between the two countries regarding the precise line of the border. It became an international boundary with the independence of both countries from Yugoslavia in 1991. Since Croatia's first multi-party elections in 1990, the regional party Istrian Democratic Assembly (IDS-DDI, Istarski demokratski sabor or Dieta democratica istriana) has consistently received a majority of the vote and maintained through 1990s a position often contrary to the government in Zagreb, led by then nationalistic party Croatian Democratic Union (HDZ, Hrvatska demokratska zajednica) with regards to decentralization in Croatia and certain regional autonomy. However, that changed in 2000, when IDS formed with five other parties left-centre coalition government, led by Social Democratic Party of Croatia (SDP, Socijaldemokratska Partija Hrvatske). After reformed HDZ won Croatian parliamentary elections in late 2003 and formed minority government, IDS has been cooperating with state government on many projects, both local (in Istria County) and national. Since Slovenia's accession to the European Union and the Schengen area, customs and immigration checks have been abolished at the Italian-Slovenian border.











