I posted comments on the Come Follow Me lesson in two parts, here:
I pointed out there that:
"With D&C 125:3 and 128:20, we have in the scriptures for everyone to see the two keys to understanding Book of Mormon geography. Interpreting the text with those two keys unlocks not only the evidence and historicity, but the meaning of many passages.
It seems only rational to realize that if the key fits, why not use it to unlock more meaning?
And if two keys fit, all the better."
Of course, I'm referring to Zarahemla and Cumorah, respectively.
Enjoy your study!