coastline · noun C or U /ˈkoʊst.lɑɪn/Full view
C2 the part of the land along the edge of the sea
Dictionary example:

a rocky coastline

Learner example:

These buildings, which haven't been looked after and maintained for many years, give the coastline around Land's End an almost ghostlike atmosphere. (Certificate of Proficiency in English; C2; Danish)

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