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I'm new to QGIS and I'm trying to create a statewide map using specific regions, which break down by county. The steps I'm using are:

  1. Vector Geometry: Fix geometries
  2. Vector Geometry: Delete holes
  3. Vector Geoprocessing tools: Dissolve by region

This works, but one county still has an outline on the map, even when the region map is the only layer (though if I check the attribute table, it is combined with its region).

In the attribute table, Shape_Leng, Shape_Le_1, and Shape_Area are all 0 for only this county, so I'm guessing this may be part of the issue. Is this likely the cause of the problem? And if so, how can I fix it? I got the shapefile from the SOS of the state and I don't have any other source.

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    it's probably a topology error, check the topology for gap/overlap and fix any – J.R Nov 19 '19 at 17:07
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    It seems that the rouge county has some topology issue. Try either fixing geometries also after dissolving, or deleting holes again. – RafDouglas Nov 19 '19 at 17:11
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    The values in the attribute table are just static values in a table. They have nothing to do with the actual geometry of the feature. – csk Nov 19 '19 at 17:32
  • Deleting holes after dissolving fixed it - thanks! – hannah23 Nov 19 '19 at 18:26
  • Can you post your solution as answer in case someone else has the same question? – MrXsquared Nov 19 '19 at 19:44
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Running Vector Geometry: Delete holes after dissolving fixed the issue

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