Commonwealth of Nations
The land area of the Commonwealth nations is about , or about 21% of the total world land area. The three largest Commonwealth nations by area are Canada at , Australia at , and India at . In 2016, the Commonwealth members had a combined gross domestic product of over $9 trillion, 78% of which is accounted for by the four largest economies: United Kingdom ($2.629 trillion), India ($2.256 trillion), Canada ($1.529 trillion), and Australia ($1.258 trillion).
Commonwealth realm
In recent years, advocates have argued for free movement of citizens among a subset of the Commonwealth realms: the United Kingdom, Canada, Australia, and New Zealand, which they argue "share the same head of state, the same native language, [and] the same respect for the common law." Opinion on the prospect of the plan coming to fruition is mixed. British Eurosceptics (those critical of the European Union) have expressed a preference for a relationship "similar in nature and goals to the EU" between the same four countries: the CANZUK Union without repeating the "mistakes of Europe"—though this possibility has also been characterised as "difficult and in some ways far-fetched". Despite this, public opinion polling conducted by organisations such as CANZUK International and YouGov have indicated widespread support for free movement of goods and people across Canada, Australia, New Zealand and the United Kingdom, with support for the proposals ranging from between 58–64% in the United Kingdom, 70–72% in Australia, 75–77% in Canada and 81–82% in New Zealand.