Removing slivers or gaps between polygons

Tiny sliver polygons or gaps between polygons often result from creating new polygons without using snapping or editing shared boundaries without a topology. Slivers and gaps keep your dataset from forming a continuous fabric and should be identified and fixed as appropriate.

With an ArcEditor or ArcInfo license, you can set up a geodatabase topology. Geodatabase topology is the most efficient, automated, and thorough means of finding and fixing these errors. You can apply Must Not Overlap and Must Not Have Gaps rules to find polygons that either overlap each other or have gaps between them. You can also look for Must Be Larger Than Cluster Tolerance errors, which are polygons small enough to collapse during the process of validating the topology.

Without the ability to use geodatabase topology, there are several general ways you can find and fix these errors: