<p>Water rushes over Horseshoe Falls, one of the three falls that make up world-famous Niagara Falls. The waterfalls straddle the border between Canada and the United States; Horseshoe is on the Canadian side, in the province of Ontario. Every 60 seconds, six million cubic feet of water rushes over the falls—enough water to fill a million bathtubs each minute.</p>

Niagara Falls, Canada

Water rushes over Horseshoe Falls, one of the three falls that make up world-famous Niagara Falls. The waterfalls straddle the border between Canada and the United States; Horseshoe is on the Canadian side, in the province of Ontario. Every 60 seconds, six million cubic feet of water rushes over the falls—enough water to fill a million bathtubs each minute.

Photograph by Chris Rainier, National Geographic

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