Azerbaijan, officially the Republic of Azerbaijan, is a transcontinental landlocked country at the boundary of Western Asia and Eastern Europe. It is a part of the South Caucasus region and is bounded by the Caspian Sea to the east, Russia's republic of Dagestan to the north, Georgia to the northwest, Turkey, via the exclave of Nakhchivan, and Armenia to the west, and Iran to the south. Baku is the capital and largest city.