0086 Navigation Greater China navigation column editor The three most important economic circles in China are: the Yangtze River Delta economic circle, the Pearl River Delta economic circle and the Bohai Rim economic circle. In 2007, the GDP of these three major economic circles in China accounted for 40% of the national GDP. The Yangtze River Delta region in the three major economic circles of China refers to the estuary of the Yangtze River, where the silt contained in the river water continues to accumulate into a plain. This area includes the leading city Shanghai, Jiangsu Province and Zhejiang Province. In 2008, the country specifically issued "Guiding Opinions on Further Developing the Yangtze River Delta". The Pearl River Delta region is the land formed by the estuaries of the various water systems of the Pearl River. In early 2009, the "Outline of the Reform and Development Plan for the Pearl River Delta Region (2008-2020)", it was clearly stated that the Pearl River Delta consists of 9 cities in Guangdong Province. The Bohai Rim is the Bohai Rim coastal economic belt mainly consisting of the Liaodong Peninsula, Shandong Peninsula, Beijing-Tianjin-Hebei.