Description
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A jetty is a device designed out into the water rising to just above the surface to help control current and to provide protection. While jetties usually cannot stop a current, they may help stop some beach erosion. This means that they can help places along the seaside keep their sand in their place.
Read more here http://www.squidoo.com/what-is-a-jetty
Read more here http://www.squidoo.com/what-is-a-jetty