The border.yml is used to add a border to RWG's map preventing chunk-generation outside a given border. This border will throw back players like a invisible wall.
Outside of this border RWG will generate void-chunks.
NOTE: You will find it in plugins/RealisticWorldGenerator/worlds/<YourWorld>/border.yml
This is the default configuration of border.yml and should look like this:
border:
behind: 10
radius: 100
enabled: false
Defines the the number chunks, that RWG should generate behind the border. You should always generate as much chunks behind the border as you have set as view-distance in your server.properties.
After the behind + radius RWG will only generate void-chunks.
Defines the radius from 0/0 in chunks to the border.
If the border should be enabled, set it to true if you want to use the function.