Jetty
（重定向自Jettie）
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![Aerial view of jetties, constructed of dolos, at Humboldt Bay harbor entrance. These jetties mitigate unpredictable shifting sands and ensure 700 feet (210 m) of width.[2]](/Images/godic/202501/21/Humboldt_Bay_and_Eureka_aerial_view0212.jpg")
![North Jetty on the left and South Jetty on the right at the mouth of Sebastian Inlet in Florida from the Indian River to the Atlantic Ocean.](/Images/godic/202501/21/Sebastian_Inlet,_Florida_0010212.jpg")
A jetty is a structure that projects from the land out into water. Often, "jetty" refers to a walkway accessing the centre of an enclosed waterbody. The term is derived from the French word jetée, "thrown", and signifies something thrown out.