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.
Indus River Delta water quality, causes eutrophication, reducing the amount of habitat. Indus delta has shrunk by 92% since 1833. In light of the threats, Indus Delta was designated a Ramsar site on November 5, 2002. The WWF is working on conservation methods to alleviate the Indus delta's shortage of freshwater. The population of the delta was estimated at 900,000 in 2003 (the total population of Indus River Delta-Arabian Sea mangroves was 1.2 million). Within the river delta, about 140,000 (16% of the population) depended on the mangrove forests for their livelihood, and 60% depended on the forests for fuels. At least 75%