Belarus is 2.7 times larger than Serbia.
Area: 207,600 km2 World Factbook
Population: 9,608,058 (July 2014) World Factbook
Belarus, officially the Republic of Belarus, is a landlocked country in Eastern Europe bordered by Russia to the northeast, Ukraine to the south, Poland to the west, and Lithuania and Latvia to the northwest. Wikipedia
Area: 77,474 km2 World Factbook
Population: 7,209,764 (July 2014) World Factbook
Serbia, officially the Republic of Serbia, is a country located at the crossroads of Central and Southeast Europe, covering the southern part of the Pannonian Plain and the central Balkans. Wikipedia