Spirit Butterfly Island was a mysterious island that had never appeared on any map of the world.
It was located at the intersection of Pacific Ocean and East China Sea. The island was concealed by supernatural forces that prevented humans from snooping near it. Even the most advanced equipment could not find any trace of the island.
To ensure that the Spirit Butterfly Island remained a mysterious place, Venerable Spirit Butterfly used to shift its position at intervals of hundred years.
The Spirit Butterfly Island’s airspace was protected by surface-to-air missiles. These missiles were hidden all around the island.