You can see on this map how the river narrows at the rapids in the gorge. On the right are the two huge falls, and then the relatively wide river flowing downstream (left on the map) toward the whirlpool. The narrow stretch before than elbow in the river is where the whirlpool rapids and the white water walk are found.
It's All About Purple, she said it so well in her comment on my blog yesterday: "... the only way to really feel the force of the water is to be there, it cannot be described with words!!!".
Debbie, a resident of New Jersey, visited Niagara Falls (on the Canadian side), just a few weeks ago, and I remember thinking, here one of the bloggers I read has visited the falls, and I haven't even been there yet. It was time to organize this visit!