Croatia, officially the Republic of Croatia is a country at the crossroads of Central and Southeast Europe. It shares a coastline along the Adriatic Sea, and borders Slovenia to the northwest, Hungary to the northeast, Serbia to the east, Bosnia and Herzegovina and Montenegro to the southeast, and shares a maritime border with Italy to the west and southwest. Croatia’s capital and largest city, Zagreb, forms one of the country’s primary subdivisions, with twenty counties.
A sovereign state, Croatia is a republic governed under a parliamentary system. It is a member of the European Union, the United Nations, the Council of Europe, NATO, the World Trade Organization, and a founding member of the Union for the Mediterranean.
The area known as Croatia today was inhabited throughout the prehistoric period. Fossils of Neanderthals dating to the middle Paleolithic period have been unearthed in northern Croatia, with the most famous and the best presented site in Krapina. Remnants of several Neolithic and Chalcolithic cultures were found in all regions of the country.

Reference: https://en.wikipedia.org/wiki/Croatia