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To have a cleaner map to print I want to display only the boundary of a layer composed of more than 200,000 features (all adjacent).
Is there something more straightforward than dissolving or merging all the polygons?
I'm using QGIS.
In QGIS use the dissolve function from menu: Vector > Geoprocessing Tools > Dissolve...
This will get you a new table with only the outer perimeter geometry.
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