1.5 million people live within 50 kilometers of Niagara falls, New York.
With St. Catharines, Ontario and Niagara Falls in this area, 1.5 million people live within 45 kilometers of Buffalo, New York
The Niagara Gorge is approximately 11 kilometers (7 miles) long, stretching from Niagara Falls to the Niagara River Whirlpool.
I think you mean to ask, "How far is Niagara-on-the-lake from Niagara Falls." If that is the question, then it is about 26 kilometers.
Niagara falls is in New York.However, if you mean New York, the city, then the distance is about 495 kilometers.
Niagara Falls has eroded 11.4 kilometers (7.1 miles) during the last 12,300 years.
The Niagara Gorge extends from the Horseshoe Falls for 11 kilometers (7 miles) downstream to the beginning of the Niagara Escarpment at Queenston - Lewiston.
Niagara falls ========== In addition to Niagara Falls, there are also some much smaller falls on the Canada-US border in Quetico Provincial Park. There are three falls at Niagara. Two of them are in the USA. The Horseshoe Falls, the most spectacular of the three, is almost entirely within Canada.
570 km
about 420 kilometers
Niagara Falls is located on the border between Canada and the United States, primarily straddling the cities of Niagara Falls, Ontario, and Niagara Falls, New York. It is situated about 27 miles (43 kilometers) north-northwest of Buffalo, New York, and approximately 75 miles (121 kilometers) south-southeast of Toronto, Ontario. The falls are part of the Niagara River, which connects Lake Erie to Lake Ontario.
660 km
That is merely an opinionated question. Many people have different opinions on Niagara Falls.