Behold, the city of Gadiandi, and the city of Gadiomnah, and the city of Jacob, and the city of Gimgimno, all these have I [Jesus] caused to be sunk, and made hills and valleys in the places thereof; and the inhabitants thereof have I buried up in the depths of the earth. 3 Nephi 9:8 9:8

Trivia: What did God do to the Lamanites who joined the Nephites in 3 Nephi 2?