A Dictionary of the Book of Mormon/Antum
ANTUM. A land of North America in which was situated a hill called Shim. In this hill Ammaron deposited the sacred records (A. C. 321). Mormon afterwards, by Ammaron's direction, obtained the plates of Nephi from this hiding place and continued the record thereon. On account of his fear that the Lamanites might possess themselves of the records, Mormon, at a later period, removed them all to the Hill Cumorah. The land of Jashon appears to have bordered on the land of Antum; as the city of Jashon is said to have been near the land where Ammaron deposited the records.