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Here's when the largest cave system in Ontario opens for the season

Summary by Curiocity
Ontario nature lovers rejoice, because the province’s largest cave system, the Bonnechere Caves, is almost ready to welcome visitors underground once again for the season. Located in the Ottawa Valley — home to breathtaking natural trails — and along the Bonnechere River, the caves will reopen over the May long weekend, giving people another chance to explore the sprawling subterranean site, estimated to be around 500 million years old. The Bonn…
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Curiocity broke the news on Monday, May 11, 2026.
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