Turkey ( ( listen); Turkish: Türkiye [ˈtyɾcije]), officially the Republic of Turkey (Turkish: ; pronounced [ˈtyɾcije d͡ʒumˈhuɾijeti]), is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe. Turkey is a secular, unitary, parliamentary republic; slated to transition to a presidential system in 2019, following a 2017 referendum. Turkey is bordered by eight countries with Greece and Bulgaria to the northwest; Georgia to the northeast; Armenia, the Azerbaijani exclave of Nakhchivan and Iran to the east; and Iraq and Syria to the south. The country is encircled by seas on three sides with the Aegean Sea to the west, the Black Sea to the north, and the Mediterranean Sea to the south. The Bosphorus, the Sea of Marmara, and the Dardanelles, which together form the Turkish Straits, divide Thrace and Anatolia and separate Europe and Asia. Ankara is the capital while Istanbul is the country's largest city and main cultural and commercial centre. Approximately 70-80% of the country's citizens identify themselves as ethnic Turks. Kurds are the largest minority at about 20% of the population, and other ethnic minorities include Circassians, Albanians, Arabs, Bosniaks and Laz. Minority languages spoken today in Turkey include Kurmanji, Arabic, Zaza, Kabardian and several others.