Waters of Mormon

In the Book of Mormon, the waters of Mormon is a body of water where about two hundred Nephites are baptized.

Summary
In, Nephites living in King Noah's territory who want to listen to Alma's secret preaching gather to a place called the waters of Mormon. In the process of this preaching, Alma proceeds to invite the listeners to be baptized. Two hundred and four people are baptized, and Alma establishes a church.

Later in the Book of Mormon,, Alma's son, also named Alma, gives a sermon in which he recapitulates the history of the Nephite church and tells his audience the baptisms in the waters of Mormon.