Trouble with closing curve

I am struggling with this curve. I can’t seem to find any more issues with it- I have found plenty- but I can’t make it into a surface, so I know there is something wrong with it. Can anyone help me find out what it is or make a suggestion for a command to use to find the issues?
Thanks! olympic range.3dm (230.8 KB)

Hi Courtney - the curve has a couple of tiny loops in it - use CurvatureGraph at a scale of maybe 60 or so to locate the loops.


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Thanks @pascal