[OP: ]
The testing island that the students were on right now was situated deep beyond the northern seas, and one would have to cross a great ocean covered by many storms just to reach that place.
Teleportation to that place directly was not possible due to the extremely violent weather conditions and Mana that ran rampant all across the place.
So, to reach this island one would have to travel to the furthest distance possible with teleportation first, then take the air route to cross the dark ocean saturated by demonic beasts, after which one would have to travel for a day through the water paths, and only after the last air travel for a few hours could an individual or group of people reach the place where this test island was located.
-Swaaaaaaaash!
