Question

the raised Bank of a river formed
by Alluvial deposits

Answer 1

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An alluvial river is river in which the bed and banks are made up of mobile sediment and/or soil. Alluvial rivers are self-formed, meaning that their channels are shaped by the magnitude and frequency of the floods that they experience, and the ability of these floods to erode, deposit, and transport sediment.

Answer 2

They are called natural banks or sandbanks formed by deposition of sediments and clay. Alluvial plains are self formed i.e. their channel are shaped by their magnitude and frequency of the floods that they experience and ability of these floods to erode, deposit and transport sediment.