The outline or boundary where land meets the sea or ocean.
Compound of 'coast' (from Old French 'coste', meaning 'rib, side') and 'line' (from Latin 'linea'). The combined term emerged in the 19th century as cartography became more precise.
Measuring coastlines reveals one of geography's most fascinating puzzles - the closer you look, the longer they become, a phenomenon known as the coastline paradox that helped develop fractal geometry.
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