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I'm using ArcMap 10.3.1

I have a polygon shapefile for areas upstream of 5 monitoring sites. I used dissolveand merge to merge all these polygons together. You can download the resulting shapefile from here.

I used this shapefile in R v. 3.2.5 for further analysis. In the result of this analysis, below, there was a line cutting through the polygons

enter image description here

I checked the shapefile again in ArcMap 10.3.1 to find that after merging, there were traces outside the polygons.

enter image description here

I tried to remove them but I couldn't.

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I managed to fix the problem using

Editor -> More Editing Tools -> Advanced Editing -> Explode Multipart Features

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