Rainbow Island is located at maximum altitude almost directly above Crescent Isle.
What lies at the end of the rainbow? It's a question everyone asks when they are young, but as they grow older, it is often forgotten. Perhaps only the few who remember can find the legendary island at the end of the rainbow.
The island itself is invisible until discovered, however, there is a small streak of light (a "rainbow") stationary in the nearby airspace above Crescent Isle which is always present. Approach this rainbow to find this discovery. It can also be seen by facing north from Nasrad. The large ray of light shining down on it makes it stick out pretty well.