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 of wave energy, coupled with lack of silt flowing in from the Indus river (as mentioned above), has resulted in the formation of sand beaches. The Indus river started to form some 50 million years ago. 25 million years ago, the Indus Plain was lifted. Mangrove forests are one of the most abundant ecological communities of the delta, but they have declined over the years. According to Haq "et al.", they covered an area of until the 1980s and could be found along the entire 240 km coastline, in 40% of the tidal zone, and in 10% of the delta