Nicaragua is 413,004 times larger than Rideau Hall.
Area: 130,370 km2 World Factbook
Population: 5,848,641 (July 2014) World Factbook
Nicaragua, officially the Republic of Nicaragua, is the largest country in the Central American isthmus, bordering Honduras to the north and Costa Rica to the south. Wikipedia
Area: 0 km2 calculated
Rideau Hall is, since 1867, the official residence in Ottawa of both the Canadian monarch and the Governor General of Canada. Wikipedia