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English definition of “coastline”

coastline

noun [C or U] uk   /ˈkəʊst.laɪn/ us    /ˈkoʊst-/
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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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