coast‧line /ˈkəʊstlaɪn $ ˈkoʊst-/
noun [countable] the land on the edge of the coast, especially the shape of this land as seen from the air:
California’s rugged coastline a beautiful stretch of coastlinealong/around the coastline the sandy hills along the coastline of New England [TahlilGaran] Dictionary of Contemporary English ▲
coast noun [countable] the part of a country that is close to the sea:
The hurricane struck Florida’s coast. St Andrew’s is on the east coast of Scotland.shore noun [uncountable and countable] the land along the edge of the sea or along the edge of a lake:
The children managed to swim to shore but their father was swept out to sea. Vevey is a pretty town on the shores of Lake Geneva.the seashore the land along the edge of the sea, especially where there is sand and rocks:
Waves were crashing onto the seashore.coastline noun [countable] the edge of the land next to the sea. Used especially about a long length of land or the shape it makes, for example as seen from the air:
The road follows the rugged coastline of northern France for nearly 100 miles. Environmentalists are concerned about possible damage to some of the most beautiful stretches of Welsh coastline.seaboard noun [countable] the part of a country that is close to the sea. Used mainly about very large countries such as the US or Australia:
western/eastern etc seaboard:
Australia’s eastern seaboard ⇒
Atlantic/Pacific etc seaboard:
the Atlantic seaboard of the USthe seaside British English a place at the edge of the sea where people go for a holiday:
The children love going to the seaside.by the sea British English,
by the ocean American English on land next to the sea:
We bought a small cottage by the sea. He always walks by the ocean in the early morning. [TahlilGaran] English Thesaurus ▲