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A river is a course of water that flows to another. water source such as an ocean, lake or even another river. A river is not exactly a landform but part of other landforms such as mountains, prairies and valleys.
River Delta. A+ A-. Print Email. A river delta is a landform that is formed at the mouth of a river, where the river flows into an ocean, sea, estuary, lake, or reservoir.Deltas are formed from the deposition of the sediment carried by the river as the flow leaves the mouth of the river.ormation of Delta. River deltas form when a river carrying sediment reaches either (1) a body of standing 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.