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It's not Rainbow but Peek does now have the closest guess.
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No, it's not South Snowbird Lake. South Snowbird and Rainbow are almost equal in distance from this lake.
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Not Lady-Slipper or Tern...these two guesses are moving further away from this lake.
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Based on the many clues I think it is Source. In the pic you can barely make out 2 light blobs that could be cottages on the far shore.
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Yes, this is Source! Pic was taken at the Bruce L. portage. You're up solos.