I hiked this geologically significant area located between Lakes Huron and Ontario. It was here (just NE of Peterborough, Ontario) that a wall of water over 50 feet tall rushed as the flow of the upper Great Lakes stopped flowing north and rushed to the south. This happened approximately 10,000 years ago. This reversal was due to a combination of the land to the north rebounding from the weight of the glaciers and the melting of ice dams which had prevented flow to the south.
When the water changed course, it marked this area in a unique and dramatic way.