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.
Saskatchewan River Delta such that normally high spring and summer flows are significantly diminished. Removal of sediment outflow by impoundment has caused enlargement of channels downstream of the dam and reduction of sediment-borne nutrients to the delta ecosystem. In addition, suppression of annual discharge peaks has reduced the frequency of overbank flooding and, consequently, the frequency at which water and nutrients are replenished in the delta wetlands. Reduction of peak flows to the delta is exacerbated by the Gardiner dam on the South Saskatchewan River whose impoundment, Lake Diefenbaker, is nearly five times larger than the Tobin Lake reservoir, with a commensurately larger