Armenia, officially the Republic of Armenia, is a landlocked country in the South Caucasus region of Eurasia. Located in Western Asia, on the Armenian Highlands, it is bordered by Turkey to the west, Georgia to the north, the de facto independent Republic of Artsakh and Azerbaijan to the east, and Iran and Azerbaijan's exclave of Nakhchivan to the south. Armenia is a unitary, multi-party, democratic nation-state with an ancient cultural heritage. Between the 16th and 19th centuries, the traditional Armenian homeland composed of Eastern Armenia and Western Armenia came under the rule of the Ottoman and Iranian empires, repeatedly ruled by either of the two over the centuries. By the 19th century, Eastern Armenia had been conquered by the Russian Empire, while most of the western parts of the traditional Armenian homeland remained under Ottoman rule. During World War I, Armenians living in their ancestral lands in the Ottoman Empire were systematically exterminated in the Armenian Genocide. The modern Republic of Armenia became independent in 1991 during the dissolution of the Soviet Union.