Moroni explains that the Jaredites lived and died in the north country. Some have speculated that this was much farther north than the Nephite settlements. But we know that the Jaredites and Nephites were destroyed near the same hill, known as Ramah among the Jaredites and Cumorah among the Nephites (Ether 15:11, Mormon 6:6) Furthermore, we know that the Jaredites hunted in the land southward and built cities very close to the narrow neck of land (Ether 10:20-21). This places them north of the narrow neck but not by very far. The land of Desolation, so named because the Jaredites were destroyed there, was defined by Mormon as just north of the narrow neck, bordering the land of Bountiful to the south (Alma 22:29-32).
Joseph Fielding Smith
"We understand that they [the Jaredites] landed in Central America where their kingdom existed the greater part of their residence in America." (Doctrines of Salvation, 3:73)