Horseshoe Falls, the largest part of Niagara Falls, spans the Niagara River at the Canada–United States border between Goat Island in New York and Table Rock in Ontario. It carries about 90 percent of the river’s flow that remains after major hydropower diversions, and is also known as the Canadian Falls. Its shape has been heavily altered by border decisions and engineering, including creation of Terrapin Point in 1955 and further U.S. Army Corps of Engineers work in the early 1980s that eliminated about 400 feet of the falls. Even so, erosion continues to reshape it, with possible effects on the international boundary itself.