<Li> Monarchy was abolished on 30 December 1947 upon the proclamation of the People's Republic and was changed with the new constitution upon its adoption on 21 August 1965 as the Socialist Republic . The Communist regime fell on 22 December 1989, the new democratic government was installed on 20 May 1990 and the new post-communist constitution was adopted on 21 November 1991 . Romania joined the European Union on 1 January 2007 . </Li> <Li> Also . eu, shared with other European Union member states . </Li> <P> Romania (/ roʊˈmeɪniə / (listen) roh - MAY - nee - ə; Romanian: România (romɨˈni. a)) is a sovereign state located in Southeastern Europe . It borders the Black Sea, Bulgaria, Ukraine, Hungary, Serbia, and Moldova . It has an area of 238,397 square kilometres (92,046 sq mi) and a temperate - continental climate . With almost 20 million inhabitants, the country is the seventh most populous member state of the European Union . Its capital and largest city, Bucharest, is the sixth - largest city in the EU, with 1,883,425 inhabitants as of 2011 . </P> <P> The River Danube, Europe's second - longest river, rises in Germany and flows in a general southeast direction for 2,857 km (1775 mi), coursing through ten countries before emptying into Romania's Danube Delta . The Carpathian Mountains, which cross Romania from the north to the southwest, include Moldoveanu, at 2,544 m (8,346 ft). </P>

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