This map shows the new borders of South-East Europe after the Congress of Berlin in 1878.
Eastern Europe as regulated by the Treaty of Berlin 13 June–13 July 1878, map, 1884, unknown author; source: Labberton, Robert H: An Historical Atlas, 1884. Digitalized version: University of Texas at Austin, http://www.lib.utexas.edu/maps/historical/eastern_europe1878.jpg.