Seawall

A sea wall is just a big wall that protects the land from being taken away by the sea. When you build a sea wall most of the time the beach starts getting smaller and smaller until there is no beach left and it's just rocks piled up.

  "Seawall - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 10 Jan. 2013. <http://en.wikipedia.org/wiki/Seawall>.