Offshore ridge is a geological feature that is formed by the accumulation of sedimentary material in the ocean. It is typically composed of a REEF, which is a hard, rocky structure that is formed by living organisms, and a SANDBAR, which is a long, narrow ridge of sand that is formed by the action of waves and currents. Together, these two features form an offshore ridge that can provide a habitat for marine life and act as a barrier to protect coastal areas from storms and erosion.