Aspects of this topic are discussed in the following places at Britannica.
...fans adjacent to the base of the continental slope. Turbidites also are found below the major river deltas of the world where they build features called abyssal cones. The largest of these is the Ganges Fan (also called the Ganges Cone or Bengal Cone) in the Bay of Bengal east of the Indian subcontinent. It measures 3,000 kilometres long (north-south) by 1,000 kilometres wide (east-west) and...
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