BERM (probably a variant of "brim"), a narrow ledge of ground, generally the level banks of a river. In parts of Egypt the whole area reached by the Nile is included in the berm. Thus of the lands near Berber, Mr C. Dupuis writes (in Sir William Garstin's Report on the Upper Nile, 1904), "In most places there is a well-defined alluvial berm of recent formation and varying width, up to perhaps a couple of kilometres." In military phraseology the berm is the space of ground between the base of a rampart and the ditch.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)