The London-centered urban agglomeration, United Kingdom

Area: 45,000 square kilometers

Population: 36.65 million

Centering on the London-Liverpool axis, the London-centered urban agglomeration in the U.K. is composed of London Metropolis Economic Circle and Birmingham, Liverpool, Manchester and Leeds Urban Economic Circles. It occupies 45,000 square kilometers, accounting for 18.4 percent of the nation’s territory. The population of the area accounts for 62.7 percent of its total population. The area contributes 80 percent of the U.K.’s total economic output.