Guangdong-Hong Kong-Macao Greater Bay is a city cluster consisting of the Hong Kong and Macao Special Administrative Regions and the cities of Guangzhou, Shenzhen, Zhuhai, Foshan, Zhongshan, Dongguan, Huizhou, Jiangmen and Zhaoqing, which is an important step in China's building world-class city clusters and participating in global competition. Guangdong-Hong Kong-Macao Greater Bay is the 4th largest bay area in the world after the New York Bay Area, San Francisco Bay Area and Tokyo Bay Area. In 2017, the population in Guangdong-Hong Kong-Macao Greater Bay reached 69.57 million and GDP hit 10,000 billion yuan, accounting for 12.17 per cent of the national economic aggregate. Its GDP ranks 11th in the world, making it the most economically active area in the country.