The industrial cities in the Pearl River Delta has been called the "Factory of the World" or the "World's Factory" due to the presence of industrial parks populated with factories from foreign investments. The target market of the delta region's exports, however, has become increasingly domestic rather than foreign. Dongguan, Zhongshan, Nanhai, and Shunde (the later two are now districts of Foshan) the four cities known as the Four Guangdong Dragons for its high growth rates and rapid development from late the 1980s to the 2000s.