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A corniche is a road on the side of a cliff or mountain, with the ground rising on one side of the road and falling away on the other. The word comes from the French route à corniche or road on a ledge.
The road that runs roughly between Saint-Jean-Cap-Ferrat (east of Nice France) along the sea to Monaco has been colloquially called The Corniche. Another road to the north that parallels it is formally called the Moyenne Corniche.
The dictionary definition of corniche at Wiktionary