chenier plain An area of marine aggradation consisting of sandy ridges (cheniers) separated by clay-rich depressions. Occasionally the ridges may be vegetated, as on the Gulf Coast of the USA. Chenier plains may be large: that on the north coast of South America is about 2250 km long and up to 30 km wide.

chenier plain Area of marine aggradation consisting of sandy ridges (cheniers) separated by clay-rich depressions. Occasionally the ridges may be vegetated, as on the Gulf Coast of the USA. Chenier plains may be large: that on the north coast of S. America is about 2250 km long and up to 30 km wide.