I have these shots from the archives as well, pics I took on a visit in the early fall of 2012 and saved in my email, as the camera belonged to friends. The Barron River flows through this canyon on the east side of Algonquin Park. A hiking trail follows the canyon rim. Canoes can often be seen down on the river below. It's a hundred metres up from the river here, so a fall would result in a very bad day. Well, for your family and friends, anyway. Odds are you'd be dead.
It is a magnificent canyon, and far from the Highway 60 corridor, which is what most visitors think of when they think of Algonquin. For those of us in Eastern Ontario, this part of the park is more quickly reached.