People's Democratic Republic of Yemen
South Yemen, officially the People's Democratic Republic of Yemen, abbreviated to Democratic Yemen, was a country in South Arabia that existed in what is now southeast Yemen from 1967 until its unification with the Yemen Arab Republic in 1990. The sole communist state in the Middle East and the Arab world, it comprised the southern and eastern governorates of the present-day Republic of Yemen, including the islands of Perim, Kamaran, and the Socotra Archipelago. It shared ill-defined and often disputed borders with the Yemen Arab Republic to the northwest, Saudi Arabia to the north, Oman to the east. Its capital and largest city was Aden.