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In set theory, the union (denoted by ∪) of a collection of sets is the set of all distinct elements in the collection. It is one of the fundamental operations through which sets can be combined and related to each other.

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QGIS - Unite many lines in a single Multiline (with branches)

You can use the processing tool Dissolve
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5 votes

Using Union tool over MultiLineString in polygons layer in QGIS

Run it with default settings and try union on the cleaned result. …
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7 votes
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Merging and deleting with priority overlapping polygons in QGIS

layer will now have some holes: Now run "Merge Vector Layers" from the Processing Toolbox and choose your Protected Areas as well as the Difference-Layer as Inputs: Alternatively, you can use the "Union
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