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Reef(s) in Canada

List of reef(s) in Canada (found 10 locations). Category description: A surface-navigation hazard composed of consolidated material

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O'Brien Reef (Nova Scotia)
O'Connell Reef (Nunavut)
Obstruction Reef (British Columbia)
Ocheek Reef (Manitoba)
Octopus Reef (Nunavut)
Old Cow Reef (Nova Scotia)
Old Roger Reef (Newfoundland and Labrador)
Oro Reef (Ontario)
Outer Peak Reef (Nunavut)
Owls Head Reef (Nova Scotia)