Correction for the size of London
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How big is 500,000 acres?
It's about one-and-three-tenths times as big as London

The size of London is about 390,200 acres.
(a.k.a. Greater London) (London Region) (England, United Kingdom)
London, one of the most important global cities in the world, currently occupies a total area of 390,200 acres. For more than one hundred years, between the nineteenth and twentieth centuries, it was the largest city in the world by population.