Rainbow Spring atop Rainbow Mountain.
The Rainbow Spring is located in East Elencia at the peak of Rainbow Mountain and serves as the only place on Earth to reach Alent. It is a spring blessed by the Spirits and was given a rainbow that serves as a symbolism for the Spirits' hope for reconciliation with the humans. In the story, the Rainbow Spring was accessed by Justin and his party which enabled them to reach Alent. In order to gain passage, Justin had to obtain the Medal of Knowledge from the Underground Ruins in order to gain the Spirits' blessing. He threw the medal into the spring to create a platform to take them to Alent.