Croatia (Croatian: Hrvatska /xrvatska/), officially the Republic of Croatia (Republika Hrvatska ), is a southern Central European country at the crossroads with the Mediterranean, and Southeastern Europe. Its capital is Zagreb. Croatia borders with Slovenia and Hungary to the north, Serbia to the northeast, Bosnia and Herzegovina to the east, and Montenegro to the far southeast. Its southern and western flanks border the Adriatic Sea, and it also shares a sea border with Italy in the Gulf of Trieste. Croatia is a member of United Nations, the Organization for Security and Co-operation in Europe and the Council of Europe. The country is also a candidate for membership of the European Union and has received a NATO membership invitation on 3 April 2008. On October 17, 2007 Croatia became a non-permanent member of the United Nations Security Council for the 2008-2009 term.