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.
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Britain is approximately 243,610 square kilometers in size.
Patagonia covers an area of approximately 1,043,076 square kilometers.
Halifax covers an area of approximately 5,490 square kilometers.
Wales is about 20,779 square kilometers or 8,023 square miles.
Barbados is approximately 166 square miles in size.