The Rag'Kor Relay system is a huge man made structure using the Rag'Kor wormhole drive. The original purpose of this system was for the Rag'Kor to easily and precisly create wormholes for fast travels. Over the years the system was expanded and expanded until it eventually reached 100 000 light years wide from its origin point.
Now it requires other races to pay a fee for using this system, although it isnt a big one and is asked to travelers themself. They also ask for a bigger fee to make a portal limited to specific ships and species. It is frequently used to explore new planets and species.