Moroni told Joseph about Cumorah

Back when Latter-day Saints were familiar with authentic Church history, they understood that Moroni identified the hill where the plates were deposited as the Hill Cumorah. 

We knew this from first-hand accounts by Lucy Mack Smith, Oliver Cowdery, David Whitmer, and others, including Joseph Smith, all found in our Seminary, Sunday School, and other manuals.

See https://www.mobom.org/church-history-issues.

This was before the M2C scholars at Scripture Central managed to have those references omitted from the current curriculum to accommodate their theory that (i) Joseph and Oliver misled everyone about the origin and setting of the Book of Mormon, and (ii) the "real Cumorah" is somewhere in southern Mexico. 

This is why, when Joseph Fielding Smith made the observation shown below, it was not in the lease controversial. But today, Scripture Central spends millions of dollars to persuade Latter-day Saints that Joseph Fielding Smith (and all the others) were wrong about Cumorah.

Fun times.

JOSEPH SMITH REQUIRED TO TRANSLATE BOOK OF MORMON. Then when Moroni came to Joseph Smith, he told him that in the hill Cumorah there were certain records of the ancient people of this land, and that he was going to turn them over to him. He had Joseph Smith call on him four times, at a certain time in September each year for four years, and there instructed him. That was a school for Joseph Smith. Then he turned the record over to Joseph Smith together with the Urim and Thummim, and told him to translate it.

https://archive.org/details/JFSDoctrinesOfSalvation/page/n121/mode/2up?q=Cumorah

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For a good example of how the M2Cers do this, see 

https://www.lettervii.com/2017/12/opening-heavens-but-censoring-history.html