what are coastal dunes and barrier island ?

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Ridges or dunes (deposited particles) of sand  formed in coastal areas are known as coastal dunes. They are built on dry beaches where sand blown is trapped by plants and other obstructions present. They help in protecting the coastline.

A long, narrow, flat or lumpy sand area that run parallel to a coastline is known as barrier island. It forms a sand dune system.

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