The most fortified place in the Sea of Sol as well as the main base of operations for Heaven. There is only one port where people can dock and exchange goods, but even that is heavily restricted.
If one wants to enter the space of Earth, or the Garden as the angels call it they have to be prepared for quite a dangerous affair. Constant patrols and powerful spells keep any would be intruder out. Even if someone was able to bypass all of the outer defenses, once inside they will have to contend with the full might of the Bronze Legion, Heaven's earthly defense force.
Only the most insane dare to attempt to cross the boundary and enter this place.