Guangdong is a province on the southern coast of People's Republic of China. It borders Hong Kong and Macao and is adjacent to Southeast Asian countries. Its land territory spans 178,000 square kilometers. The advantageous geographical location enables Guangdong to serve as a window, through which China communicates with the rest of the world. The provincial capital Guangzhou and economic hub Shenzhen are amongst the most populous and important cities in China.