13,000 years ago, downtown Toronto was completely underwater—submerged beneath Glacial Lake Iroquois, a massive prehistoric lake that was bigger and deeper than Lake Ontario. This video explores how this lost Ice Age lake shaped modern Toronto, from Davenport Road (which traces the ancient shoreline) to the clay soil that frustrates gardeners and construction crews across the city. Discover how a catastrophic drainage event transformed this giant lake into Lake Ontario, leaving behind geological fingerprints that define Toronto’s landscape today.
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