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The world ’ s fourth most densely populated city , Hong Kong ( officially the Hong Kong Special Administrative Region of the People ’ s Republic of China ) occupies 426 sq . miles and is home to over 7.4mn people . In the Arcadis rankings , Hong Kong ’ s position in the top ten is driven by a very high score in the planet category , while the city received only average rankings for people and profit . Hong Kong is the world ’ s seventh-largest trading entity and has the seventh-longest life expectancy . www . discoverhongkong . com

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