Ley Lines

Ley Lines are the lines that connect the worlds and stabilize them, without ley lines each world would be disconnected and torn apart, ley lines provide teleportations in between dimensions, domains, realms and much more. 
The example of Ley Lines work are Dragon Islands that seem to have no location but exists, and the only way to enter is by Heartly Portal which has the right to exist because of Ley Lines that provide connection between Vi'zarrdia and Dragon Islands.