Yerevan's country is Armenia, which is a landlocked country located in the South Caucasus region of Eurasia. It is bordered by Georgia to the north, Azerbaijan to the east, Iran to the south, and Turkey to the west. Armenia is a unitary, multi-party, democratic nation-state with an ancient cultural heritage. It is the world's oldest Christian nation and has a rich history that dates back to the 6th century BC. Armenia is a member of the Council of Europe, the Eurasian Economic Union, the Collective Security Treaty Organization, and the United Nations.