This is a collective name for three waterfalls that straddle the international border between Canada and USA
I did not know there was an organization just for managing tree waterfalls, are they the Niagara waterfalls ?
They make the southern end of the Niagara Gorge
I did not know there were specifically 3 waterfalls, do they have specific name ? 
The waterfalls that make up Niagara are  the Horseshoe Falls, the American Falls and the Bridal Veil Falls.
I did not know that, where are they placed on Niagara Gorge ?
Over six million cubic feet  of water goes over the crest of the falls every minute.