“Once upon a time, there was a faraway island where jeweled fruit grew on the trees. A young man took one of the fruits to cure his sick mother, but in return, had to come back to the island to become one of the magical trees.” - A Yafutoman Fairy Tale
The easiest way to find this discovery is to wait until after obtaining the Purple Moon Crystal. After that, fly along the Impenetrable Stone Reef west of Ixa'Taka until you cross the Dark Rift. Descend to mid-sky and head directly west.