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Mainly rivers come from other rivers flowing into them which usually come down from a a mountain thousands of miles away with melting snow and ice. The Mississippi starts out as a peaceful Lake in Minnesota that is kept full by the hydrocycle of sea water evopration turning into rain.
River deltas form when a river carrying sediment reaches either (1) a body of water, such as a lake, ocean, or reservoir, (2) another river that cannot remove the sediment quickly enough to stop delta formation, or (3) an inland region where the water spreads out and deposits sediments.