A berm is an earthen barrier or embankment, typically used for flood control or to separate land areas. It can also be used as a SHELF or LEDGE, which is what the crossword solutions refer to. A SHELF is a flat surface, usually horizontal, that is used to store or display items. A LEDGE is a narrow, raised surface, often found along the edge of a wall or cliff. Both terms can be used to describe a berm, which is why they were used in the crossword.