Croatia (ⁱ/kroʊˈeɪʃə/ kroh-ay-shə; Croatian: Hrvatska pronounced [xř̩ʋaːtskaː]), officially the Republic of Croatia (Croatian: Republika Hrvatska  listen (help·info)), is a unitary democratic parliamentary republic in Europe at the crossroads of Central Europe, the Balkans, and the Mediterranean. Its capital and largest city is Zagreb. The country is divided into 20 counties and the city of Zagreb. Croatia covers 56,594 square kilometres (21,851 square miles) and has diverse, mostly continental and Mediterranean climates. Croatia's Adriatic Sea coast is long and traced by more than a thousand islands. The country's population is 4.29 million, most of whom are Croats, and the main religion is Roman Catholicism.