The Canso Causeway reference article from the English Wikipedia on 24-Apr-2004
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Canso Causeway

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The Canso Causeway connects Cape Breton Island to the mainland of the province of Nova Scotia in eastern Canada. Completed in 1955, the mile long causeway crosses the Strait of Canso. Before the construction of the causeway, Cape Breton was connected to the mainland by ferries for motor vehicles and railway cars.

Canso comes from the Mi'kmaq word "kamsok", which means "opposite the lofty cliffs."