The term 'Canyon Feature' can be broken down into two crossword solutions: ECHO (4 letters) and RIM (3 letters). ECHO is an acoustic phenomenon in which sound is reflected off a surface and returns to the listener with distinct repetition. This effect is often seen in canyons, where the walls of the canyon reflect sound waves back and forth, creating a reverberating effect. RIM is the edge or outer boundary of a canyon. It is the highest point of the canyon walls, and is often the most visible feature of a canyon.