“The City of Moroni Did Sink into the Depths of the Sea”

Joseph F. McConkie, Robert L. Millet
The city of Moroni was an important coastal city in the extreme southeast of the Nephite possessions. It was built as an outpost to protect that portion of the Nephite dominion from Lamanite invasion and was thus strongly fortified.

Doctrinal Commentary on the Book of Mormon, Vol. 4