Canyon's Edge is a term used to describe the edge of a canyon, which is typically characterized by steep cliffs and rocky terrain. The term can also be used to refer to the rimrock, which is the outermost layer of rocks that form the edge of the canyon. The rimrock is usually composed of sedimentary rocks such as sandstone, limestone, and shale. The term RIMROCK is an anagram of the word 'RIM' which has seven letters, and RIM is an anagram of the word 'RIM' which has three letters.