Paul R. Cheesman writes on the location of the Hill Cumorah in The Instructor magazine.
Paul R. Cheesman, "Archaeology and the Book of Mormon," The Instructor 103, no. 11 (November 1968): 429
Geography of the Book of Mormon
The geography of a country always helps us to understand its people better. Evidently it was not considered of prime importance to the writers of the Book of Mormon, however, since sufficient detailed information is not provided for us to determine with certainty the location of the areas or cities of the history. This should not discourage continuous study in this field, since future findings may help to establish the geography and thus clarify some aspects of the Book of Mormon.
There are those who believe that there are two Hill Cumorahs. Their theory is that the hill on which Mormon fought the last battle with the Lamanites is not the same hill in which Joseph Smith found the gold plates. Advocates of this theory establish their analysis primarily from the internal evidences of the Book of Mormon. Others conclude that there is only one Hill Cumorah, and that the place where Joseph Smith and Moroni met was the same place Mormon and Moroni visited in the fifth century. There is no official Church view.
. . .
That some immigrants came by the Bering Strait is the most widely accepted theory among archaeologists regarding the early migrations. It could be true that some groups came across this Strait. The Book of Mormon does not say.