S. Sudan is 24 times larger than Rwanda.
Area: 26,338 km2 World Factbook
Population: 12,337,138 (July 2014) World Factbook
Rwanda, officially the Republic of Rwanda, is a sovereign state in central and east Africa. Located a few degrees south of the Equator, Rwanda is bordered by Uganda, Tanzania, Burundi and the Democratic Republic of the Congo. Wikipedia
Area: 644,329 km2 World Factbook
Population: 11,562,695 (July 2014) World Factbook
South Sudan, officially the Republic of South Sudan, is a landlocked country in northeastern Africa that gained its independence from Sudan in 2011. Its current capital is Juba, which is also its largest city. Wikipedia