Ghana is 1,516,835 times larger than University Botanical Garden (Oslo).
Area: 238,533 km2 World Factbook
Population: 25,758,108 (July 2014) World Factbook
Ghana, officially called the Republic of Ghana, is a sovereign multinational state and unitary presidential constitutional democracy, located along the Gulf of Guinea and Atlantic Ocean, in the subregion of West Africa. Wikipedia
Area: 0 km2 calculated
The University Botanical Garden at Tøyen in Oslo is Norway's oldest botanical garden, established in 1814. It is administrated by the University of Oslo. The University of Oslo's oldest building, the Tøyen Manor which was given as a gift in 1812, is located in the garden. Wikipedia