A Dictionary of the Book of Mormon/Gadiandi
GADIANDI. A city which, with all its vile inhabitants, who had persecuted and slain the prophets and people of God, was sunken deep in the earth at the time of the Messiah's crucifixion, and the surface of the land so changed that valleys and hills took its place. This calamity befell them, to use the words of the Savior “to hide their wickedness and abominations from before my face, that the blood of the prophets and the saints should not come up any more unto me against them.” (III Nephi, 9:8.) This is the only mention that is made of Gadiandi in the Book of Mormon; and consequently nothing is known of its situation.