How can I find lines that are not connected to a network and identify "gaps" in a network?

See example below:

enter image description here

  • 3
    what makes you thin the top red circle would be connected?
    – Ian Turton
    Commented Nov 29, 2021 at 15:39
  • @BERA: That is exactly what I am looking for. But I don't understand why the tolerance has to be in degrees no matter if I have a layer projected in UTM or WGS84.... Commented Nov 29, 2021 at 19:03


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