jetty

/ˈdʒɛti/
noun
  1. A structure built out into water, such as a lake or ocean, used as a landing place for boats or to protect a harbor from waves and currents.
    • Fishermen sat at the end of the jetty, casting their lines into the deep water.
    • We tied our small boat to the wooden jetty and walked into town.
    • The old stone jetty protects the harbor from strong ocean waves.