A flood prevention barrier is a structure, such as a LEVEE, that is built to protect an area from flooding. A LEVEE is an embankment of earth or other material that is designed to prevent flooding by holding back water. Levees are often used in areas that are prone to flooding, such as near rivers and coasts. They can also be used to protect cities and towns from flooding. Levees are an important part of flood prevention and can help to reduce the damage caused by floods.