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Barcelona is the capital city of the autonomous community of Catalonia in the Kingdom of Spain, as well as the country's second most populous municipality, with a population of 1.6 million within city limits.

Its urban area extends beyond the administrative city limits with a population of around 4.7 million people, being the sixth-most populous urban area in the European Union after Paris, London, Madrid, the Ruhr area and Milan.

It is the largest metropolis on the Mediterranean Sea, located on the coast between the mouths of the rivers Llobregat and Besòs, and bounded to the west by the Serra de Collserola mountain range, the tallest peak of which is high.

Hong Kong (pronunciation in Hong Kong Cantonese), officially the Hong Kong Special Administrative Region of the People's Republic of China, is an autonomous territory on the Pearl River Delta of East Asia.

Macau lies across the delta to the west, and the Chinese province of Guangdong borders the territory to the north.

With a total land area of and a population of over 7.3 million of various nationalities, it ranks as the world's fourth most densely populated sovereign state or territory.

London is the capital and most populous city of England and the United Kingdom.

Standing on the River Thames in the south east of the island of Great Britain, London has been a major settlement for two millennia.

It was founded by the Romans, who named it Londinium.

London's ancient core, the City of London, largely retains its medieval boundaries.

Since at least the 19th century, "London" has also referred to the metropolis around this core, historically split between Middlesex, Essex, Surrey, Kent, and Hertfordshire, which today largely makes up Greater London, governed by the Mayor of London and the London Assembly.