Hayastan / Hayasdan lead to this page. For other uses, see HayastanArmenia, officially the Republic of Armenia, is a mountainous country in the South Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bordered by Turkey to the west, Georgia to the north, the de facto independent Nagorno-Karabakh Republic and Azerbaijan to the east, and Iran and the Azerbaijani exclave of Nakhchivan to the south.Armenia is a unitary, multi-party, democratic nation-state with an ancient cultural heritage. The Kingdom of Armenia was established in the 6th century BC, after the fall of Urartu; it became the first state in the world to adopt Christianity as its official religion, in the early years of the 4th century. For this reason, Armenia is often referred to as the "first Christian nation." An Armenian principality and later a kingdom, known as Cilician Armenia, existed on the coast of the Mediterranean Sea between the 11th and 14th centuries.By the 19th century, the traditional Armenian homeland was divided between the Ottoman and Russian empires. During World War I, the Armenians living in their ancestral lands in the Ottoman Empire were systematically exterminated in the Armenian Genocide. After almost 600 years of statelessness, Armenia was able to become independent in 1918; however, the First Republic of Armenia was surrounded by hostile countries that forcibly ended its independence in 1920. Between 1920 and 1991, Armenia was part of the Soviet Union. The modern Republic of Armenia became independent in 1991.The Republic of Armenia recognizes the Armenian Apostolic Church, the world's oldest national church, as the country's primary religious establishment. Armenians have their own unique alphabet, which was invented by Mesrop Mashtots in 405 AD.Armenia is a member of the Council of Europe and the Collective Security Treaty Organization. Armenia supports the de-facto independent Nagorno-Karabakh Republic, which was proclaimed in 1991.