Jetties are an interesting and important structure seen in many marine habitats, in both freshwater and saltwater environments. They are long, thin walls constructed of boulders, rock and concrete that jut out from the shore, designed to modify the flow of water. Jetties provide several benefits and are an indispensable tool used to protect shorelines and waterways. The primary purpose of jetties is to reduce coastal erosion by modifying the natural flow of the sea water. By fencing off the current, the structure deflects the waves and breaks the force of the water against the coastline. Jetties also serve a practical purpose by providing a safe place for ships to dock and anchor. This reduces the risks of ship damage and makes for safer navigation. Jetties also play an ecological role by creating a reef-like habitat for aquatic organisms. The structure provides protection from predators and a refuge from strong currents, which in turn attracts rich local biodiversity. Jetties are also a great spot for fishermen, as they have a tendency to attract baitfish and other small organisms that larger species feed on. In sum, jetties are an important tool for coastal and marine management for their protective and ecological benefits. Not only do the structures improve shoreline protection, but they also provide habitats for biodiversity and create a safer environment for ships and fishermen. For these reasons, jetties are an indispensable structure in both freshwater and saltwater environments.