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The Southeast Michigan and Southwest Ontario Regions represent the busiest corridor for trade between Canada and the United States. International border crossings in this area occur via several routes: the Ambassador Bridge between Detroit and Windsor; the Detroit-Windsor Tunnel; the Blue Water Bridge between Port Huron, Michigan, and Sarnia, Ontario; two railroad tunnels; and a ferry that carries trucks across the Detroit River. The Soo Locks at Sault St. Marie is another crossing point.