Protected by a magical barrier, it's the elvish capital. There has been no contact between the humans and elvish people of this city since the great war 120 years ago. That was the year the great barrier was raised, cutting them off from the rest of the world and the elves still on the rest of the isles.
A great magical barrier
Industry & Trade
None, all is contained within the island
Once the elves trades with the humans. During the great ecliptic war 120 years ago, they raised the barrier, leaving everyone out and trapping themselves.