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River deltas

A river delta is one of the forms of a river mouth, a lowland created by deposition of river sediments with river distributaries and channels going through it. It is formed when there is no water current strong enough to flow away the supplied river sediments. Sometimes the so-called inland deltas may be formed not in the river mouth but upstream. Usually they are related with a former river month on former lake beds. Such a former lake bed could be now a drainless basin where the river waters may completely evaporate.

Selected deltas of the world's largest rivers: