Jetty

Coastal lagoons fronted by barrier spits typically have entrances that migrate over time. Here, the entrance has been fixed by jetty construction. Carlsbad, California, April 1998.
Aerial view of a jetty at Swakopmund, Namibia (2017)

A jetty is a structure that projects from land out into water. A jetty may serve as a breakwater, as a walkway, or both; or, in pairs, as a means of constricting a channel. The term derives from the French word jetée, "thrown", signifying something thrown out.[1]

  1. ^ "the definition of jetty". Dictionary.com. Retrieved 4 April 2018.

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