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Is this actually water in the summer and it freezes in the winter so it can be used as a road?

Yes, in the photos, I am on Yellowknife Bay, on the Dettah Ice Road, with 100 feet or so of water under about 5 feet of ice.

It used to scare me to be on the ice...I felt a kind of vertigo, but not so much anymore.

That's very cool. Thanks.