South Africa is 2.1 times larger than Madagascar.
Area: 587,041 km2 World Factbook
Population: 23,201,926 (July 2014) World Factbook
Madagascar, officially the Republic of Madagascar and previously known as the Malagasy Republic, is an island country in the Indian Ocean, off the coast of Southeast Africa. The nation comprises the island of Madagascar, as well as numerous smaller peripheral islands. Wikipedia
Area: 1,214,470 km2 World Factbook
Population: 48,375,645 (July 2014) World Factbook
South Africa, officially the Republic of South Africa, is a country located at the southern tip of Africa. It has 2,798 kilometres of coastline that stretches along the South Atlantic and Indian oceans. Wikipedia