Niagara Falls is the collective name for three waterfalls that straddle the international border between Canada and the United States; more specifically, between the province of Ontario and the state of New York.
Accordding to information from the Niagara Parks :-
• More than 168,000 cubic metres (6 million cubic ft.) of water go over the crestline of the Falls every minute during peak daytime tourist hours.
• The average fall from Lake Erie to the beginning of the upper Niagara Rapids is only 2.7 metres (9 ft.)
• The Canadian Horseshoe Falls drops an average of 57 metres (188 ft.) into the Lower Niagara River.
• The crest line of the Canadian Horseshoe Falls is approximately 670 metres (2,200 ft.) wide. The plunge pool beneath the Falls is 35 metres (100 ft.) deep.
This is seen on board a cruise boat "Hornblower" originated from the Canadian side. Below the rainbow arc in the left is part of the American Falls, while the left arm of the Horseshoe Falls is briefly highlighted by sunlight peeping through cracks of thick misty clouds.