The term 'Wall of Earth' is a type of earthwork structure, also known as a BERM (4 letters). It is a mound of soil or rock that is built up to form a barrier or boundary. The wall of earth can be used for a variety of purposes, such as to protect against flooding, to create a windbreak, or to provide a visual barrier. It is often used in landscaping and gardening, as well as in military fortifications.