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I should move some vertices of a polygon to fix the boundaries of a country, how can I do it while keeping the adjacent polygons still connected? Is there a way to anchor permanently overlapped vertices of adjacent polygons?

I'm using Qgis

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up vote 2 down vote accepted

In Settings -> Snapping Options,

Check the box that says Enable Topoloogical Editing

Now you can move the shared vertices together.

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