Guangzhou (Chinese: 广州) — known historically as Canton or Kwangchow — is the capital and largest city of the Guangdong province, People's Republic of China. Located on the Pearl River, about 120 km (75 mi) north-northwest of Hong Kong and north-northeast of Macau, Guangzhou is a key national transportation hub and trading port. One of the five National Central Cities, it holds sub-provincial administrative status.
Guangzhou is the third largest Chinese city and southern China's largest city. As of the 2010 census, the city had a population of 12.78 million. Some estimates place the population of the entire Pearl River Delta Mega City built up area as high as 40 million including Shenzhen (10.36 million), Dongguan (8.22 million) and most parts of Foshan (7.19 million), Jiangmen (4.45 million), Zhongshan (3.12 million) and a small part of Huizhou adjoining Dongguan and Shenzhen, with an area of about 20,000 square kilometres (7,700 sq mi) (about the same size as Slovenia). In 2008 Guangzhou was identified as a Beta World City by the global city index produced by the GaWC, the Globalization and World Cities Research Network.
Canton Tower (Chinese: 广州塔), formerly known as Guangzhou TV Astronomical and Sightseeing Tower (Chinese: 广州电视台天文及观光塔) and also known as Guangzhou Tower (Chinese: 廣州塔), is a 600 m-high (2,000 ft) multi-purpose Chinese observation tower in the Haizhu District of Guangzhou (historically known as Canton or Kwangchow), Guangdong, China. The tower was topped out in 2009 and it became operational on 29 September 2010 for the 2010 Asian Games. The tower briefly held the title of tallest tower in the world, replacing the CN Tower, before being surpassed by the Tokyo Skytree in 2011. It is the tallest structure in China and the fourth-tallest freestanding structure in the world.