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barrier beach[′bar·ē·ər ‚bēch]
a strip of alluvial land that separates a lagoon or liman from the sea. Formed by the surf and by wave action that results in longitudinal (along the shore) or transverse shifting of detritus, it is composed of sand, pebble gravel, or shell material. An example of a large barrier beach is the Arabat Tongue, which separates the Sivash Lagoon from the Sea of Azov.