Natural levees are most commonly associated with which of the following environments?
Floodplains of large rivers
A natural levee is a low ridge of sediment deposited by a river along its banks during repeated floods.
When a river overflows its channel, the velocity drops sharply at the banks, causing the heavier, coarser sediment to settle there. Over time these deposits build up into elevated ridges flanking the channel — a feature most typical of the floodplains of large rivers.
Arid deserts (wind action), glacial valleys (ice action) and coastal lagoons (marine deposition) do not produce levees in this sense.
Hence the correct answer is Floodplains of large rivers.
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