Zambia is 29 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: 752,618 km2 World Factbook
Population: 14,638,505 (July 2014) World Factbook
The Republic of Zambia is a landlocked country in Southern Africa, neighboring the Democratic Republic of the Congo to the north, Tanzania to the north-east, Malawi to the east, Mozambique, Zimbabwe, Botswana and Namibia to the south, and Angola to the west. Wikipedia