Great Britain (the island) is 229,848 km2.
However, if you mean the United Kingdom (whose previous name was Great Britain and is still often referred to as such), the area is 243,610 km2.
Britain is approximately 243,610 square kilometers in size.
Patagonia = 1,043,076 sq km (Argentina 786,983 sq km + Chile 256,093 sq km)
Halifax covers an area of approximately 5,490 square kilometers.
Land area: 8,019 sq mi (20,768 sq km).
Barbados is approximately 166 square miles in size.