River delta The Okavango Delta in Botswana is one example. The generic term "mega delta" can be used to describe very large Asian river deltas, such as the Yangtze, Pearl, Red, Mekong, Irrawaddy, Ganges-Brahmaputra, and Indus. The formation of a delta is complicated, multiple, and cross-cutting over time, but in a simple delta three main types of bedding may be distinguished: the bottomset beds, foreset/frontset beds, and topset beds. This three part structure may be seen in small scale by crossbedding. The Ganges/Brahmaputra combination delta, which spans most of Bangladesh and empties into the Bay of Bengal, is the world's largest delta.
Yangtze River Delta If based on the greater Yangtze River Delta zone, it has over 140 million people in this region. Having a fertile soil, the Yangtze River Delta abundantly produces grain, cotton, hemp and tea. In 2017, the Yangtze River Delta had a GDP of approximately US$1.5 trillion (or US$3.0 trillion in PPP), about the same size as Russia. Since the fourth century, when the national capital was moved to Jiankang (present-day Nanjing) at the start of the Eastern Jin dynasty (AD 317–420), the Yangtze River Delta has been a major cultural, economic, and political centre of China. Hangzhou served as the