Canary Wharf is a privately owned financial district of London, England, located in the Isle of Dogs in the London Borough of Tower Hamlets. The Greater London Authority defines it as part of London's central business district, alongside Central London. Alongside the City of London and the West End, it constitutes one of the main financial centres in the United Kingdom and the world, containing many major global companies and banks' headquarters and high-rise buildings, including the third-tallest in the UK, One Canada Square.