Eritrea is 4.5 times larger than Rwanda.
Area: 117,600 km2 World Factbook
Population: 6,380,803 (July 2014) World Factbook
Eritrea, officially the State of Eritrea, is a country in the Horn of Africa. Eritrea is the Italian form of the Greek name Ἐρυθραία, meaning "red [land]". With its capital at Asmara, it is bordered by Sudan to the west, Ethiopia in the south, and Djibouti in the east. Wikipedia
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