The locations of the Lamanites who were converted unto the Lord are noted in Alma 23:8-13. Since the cities of "Lemuel" and "Shimnilom" are mentioned in the same verse with the land of Shilom and the land of Shemlon (Alma 23:12), they might have been fairly close to one another. Both the land of Shilom and the land of Shemlon were mentioned in apparent close approximation to the land of Lehi-Nephi during the times of Zeniff (Mosiah 9:6, 10:7). The reader should note that the city of Lemuel has a purely Lemuelite name.
“The City of Shimnilom”
In 1999, the Zarahemla Research Foundation (RLDS) finished an exhaustive review of all known manuscripts and editions of the Book of Mormon in order to restore the text "to its purity." The result was the Restored Covenant Edition of the Book of Mormon. One of their "restorations" involves the geographical place name "Shimnilom" (Alma 23:12), which they have changed to read "Shimnilon." [Zarahemla Research Foundation, "Geography Concordance" in The Book of Mormon: Restored Covenant Edition, p. 1012]
Note* This must be considered tentative subject to the verification of Royal Skousen, director of the Book of Mormon manuscript project, who will not comment at this time relative to such changes. [Personal communication, 11/22/1999]