This linked file, proclaimed.zip, is the boundary of the Santa Fe National Forest as supplied by the USFS.
If you focus on this area




There is some problematic geometry. If I do a dissolve I get this:



If I remove the holes, I'm left with this bit of stray boundary:


I then remove that with edit nodes. But the resulting polygon is still not clean  - if I try to use the field calculator to add the area (using $area), I get null.
There is bad geometry that I'm not spotting, but how do I find it?


The second linked file, clean.zip, is the result of the steps above.



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