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coastline

noun [C or U]
 
 
/ˈkəʊst.laɪn/ US  /ˈkoʊst-/

Definition

C2 the particular shape of the coast, especially as seen from above, from the sea, or on a mapMaps and map-makingCoasts and beachesBays and gulfs
(Definition of coastline noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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