Hong Kong, officially the Hong Kong Special Administrative Region of the People's Republic of China, is an autonomous territory on the eastern side of the Pearl River estuary in East Asia, south of the mainland Chinese province of Guangdong, and east of the special administrative region of Macau. With over 7.3 million Hongkongers of various nationalities in a territory of 1,104 km², Hong Kong is the fourth-most densely populated region in the world.
The territory features the most skyscrapers in the world, surrounding Victoria Harbour, which lies in the centre of the city's dense urban region. It has a very high Human Development Index ranking and the world's longest life expectancy. Over 90% of its population makes use of well-developed public transportation. Along with Macau, Guangzhou, Shenzhen, Zhuhai, and several other major cities in Guangdong, Hong Kong forms a core part of the Pearl River Delta metropolitan region, one of the most populated areas in the world.
Description by Wikipedia