Nephihah was a Nephite city founded by Moroni1 around 72 B.C. on a site between the cities of Moroni and Aaron, joining their borders (Alma 50:14). When the Lamanites under Amalickiah took the city of Moroni around 62 B.C., those who fled gathered at Nephihah, where the people of Lehi also assembled to meet the Lamanites in battle (Alma 51:23–24). Amalickiah held his forces back from attacking it at that time, keeping them along the seashore.
Some years later the people of Nephihah, who had come from the cities of Moroni, Lehi, and Morianton, were attacked by a Lamanite army acting under Ammoron and were driven out, joining the army of Moroni; the city was lost (Alma 59:5–11). Moroni and Pahoran1 later marched against it. The Lamanites would not come out to fight on the plains of Nephihah, so Moroni spied out their camp by night, had his men scale the wall on the west with cords and ladders while the Lamanites slept, and was inside the city by morning. The Lamanites fled, and Moroni and Pahoran took the city without the loss of one Nephite soldier (Alma 62:14–30).
Lamanite prisoners taken in the campaign joined the people of Ammon and became a free people. Alma 51:25–26 lists Nephihah among the cities Amalickiah took along the east borders by the seashore, which has been read as a possible second city of the same name in a separate location.