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Niagara Gorge is an 11 km (6.8 mi) long canyon carved by the Niagara River along the Canada–United States border, between the U.S. state of New York and the Canadian province of Ontario. It begins at the base of Niagara Falls and ends downriver at the edge of the geological formation known as the Niagara Escarpment near Queenston, Ontario, where the falls originated about 12,500 years ago. The position of the falls has receded upstream toward Lake Erie because of the falling waters' slow erosion of the riverbed's hard Lockport dolomite (a form of limestone that is the surface rock of the escarpment), combined with rapid erosion of the relatively soft layers beneath it. This erosion has created the gorge.
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