AAA Editor Notes
Canso Causeway crosses the Strait of Canso and links Cape Breton Island with the mainland. Said to be the world's deepest causeway, it reaches a depth of 65 metres (213 ft.) and is 244 metres (800 ft.) wide at the base. An estimated 10 million tons of rock were used in its construction. The causeway prevents ice from entering the Strait of Canso. A navigation lock allows the passage of oceangoing traffic.