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.
Pearl River Delta Economic Zone 2020. Six cities surround the geographic delta, with a seventh city over the ocean, comprising a total land of roughly 29,000 square kilometers (11,200 square miles). This figure does not include inland Huizhou and Zhaoqing city which amalgamates with the area, nor the separately governed territories of Hong Kong and Macau. The Pearl River Delta Economic Zone encompasses nearly 7000 square kilometers, 0.07 percent of China, with a population of 22 million people, 3.1 percent of the 2010 population of mainland China. A report by the World Bank described this zone as the third largest urban area in the world.