Example of a River Delta Landform:
Mississippi Delta, Louisiana, USA
The river delta picture above is of the Parana river delta in Argentina.
A river delta is a section of a river that separates into channels as it enters another body of water.The delta includes the land between channels and the marshlands and other wetlands formed in the area. The Okavango Delta in Botswana is an exception, because it does not enter another body of water. It is a wetland oasis in the desert.
A river delta can form as sediment is carried downstream near the mouth of the river. As this portion of the river becomes more shallow, it can separate into two or more channels forming a river delta over a long period of time. Sediment can also accumulate beyond the mouth of a river and extend channels of a delta further into the sea or other body of water. The rate of flow, the type of sediment and the action of tides can all affect the formation of a delta.
A river delta can cover just a few square miles, or an area of hundreds or thousands of square miles of land.
A river delta may be found where a river enters another body of water. Many rivers don´t have a river delta.
• Mississippi Delta, Louisiana, USA
• Volga Delta, Russia
• Nile Delta, Egypt
• Ganges Delta, India and Bangladesh
The Mississippi Delta is the largest river delta in North America, covering an estimated area of from 10,000 to 13,000 square miles of land according to various sources. About half of this area includes wetlands formed within the delta.
Due to many levees for flood control of the Mississippi, the flow rate has increased, greatly reducing the amount of sediment deposited. The delta region along the coast has lost over 1,800 square miles of wetland areas as a result during the past 80 years. The Volga Delta of Russia enters the Caspian Sea and is the largest river delta in Europe.
The delta has grown to nine times its original size during the last 120 years, now covering over 10,000 square miles of land. The Nile Delta in Egypt extends across an area of from 8,000 to 10,000 square miles of land according to different sources. There are two main channels that now flow from the Nile to the Mediterranean Sea.
In the past, there were several more channels, now lost as flood control reduced the amount of sediment deposited in some areas. The world´s largest river delta is the Ganges Delta, most of which is in the country of Bangladesh. One third of the delta lies in India, and all waters flow into the Bay of Bengal. Sources differ for land coverage of the Ganges Delta, ranging from 23,000 to over 40,000 square miles of land.
Channels of a river entering into another body of water such as an ocean.
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