Hi I want to extend a biut the region borders to include a far north island in the game but I don't even know where the borders begin or are in the editor , how do I edit them , how do I see them ?

In World-> Regions... change the Region to "Tamriel" and edit the region called "BorderRegionSkyrim", I would say.

what you man by change the region to tamriel what reegion shouldI change?

ah ok I found but how do I do to just enlarge a bit and not redo all all I see is I canadd some X and connect them with a line ...

Consider using a new worldspace instead, because only one mod can ever edit the border region.

If you open the border a few cells to the north and another mod does the same to add new content to the east, then only one of the modded areas will be accessible. The alternative is telling your users to disable region borders (using an ini setting or another plugin that disables the border).

can I put and mod a region beyond the border , not altering the border with ini or other so that the player cannot cross the border but then use a teleport to bring the player beyond the border in that region?