A raised road or path built across water, a marsh, or wet ground, allowing travel across otherwise impassable terrain.
From 'cause' (Old French 'causée,' a raised road) plus 'way.' Used since the 1400s to describe engineering structures connecting land across water.
Causeways are some of the oldest human engineering—the Romans built them across swamps 2,000 years ago, and many modern roads still follow ancient causeway routes because once you find a dry path, nobody wants to find another.
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