Azerbaijan (UK: (), US: ; Azerbaijani: Azərbaycan [ɑːzæɾbɑjˈdʒɑn]), officially the Republic of Azerbaijan, is a country located at the boundary of Eastern Europe and Western Asia. It is a part of the South Caucasus region, and is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia and Turkey to the west, and Iran to the south. Baku is the capital and largest city.