Mauritania is 505 times larger than Mauritius.
Area: 1,030,700 km2 World Factbook
Population: 3,516,806 (July 2014) World Factbook
Mauritania, officially the Islamic Republic of Mauritania, is a country in the Maghreb region of western North Africa. Wikipedia
Area: 2,040 km2 World Factbook
Population: 1,331,155 (July 2014) World Factbook
Mauritius, officially the Republic of Mauritius, is an island nation in the Indian Ocean about 2,000 kilometres off the southeast coast of the African continent. The country includes the island of Mauritius, Rodrigues, the islands of Agalega and the archipelago of Saint Brandon. Wikipedia