Waters of Mormon
There is also a excelent candidate for the waters of Mormon found in Missouri. Being based on the geography and features of the spring and the description given by the Book of Mormon and D&C. There is a good chance this is where Alma baptized those who believed in the prophet Abinadi
This is how Alma described the waters of Mormon Mosiah 18:5
5 Now, there was in Mormon a fountain of pure water, and Alma resorted thither, there being near the water a thicket of small trees, where he did hide himself in the daytime from the searches of the king.
What sticks out is it is described as a fountain of pure water.
Big Springs, Missouri fits this description. Big Springs is a single spring that has a daily out flow of 286 million gallons per day. Enough that the springs creates white water as it enters what appears to be glacial crystal clear pool of water. You can see the white water that is produced from the out flow of the spring.
http://www.scienceviews.com/parks/bigspring.html
How do we know that the waters of Mormon should be in Missouri the Book of Mormon and Doctrine and Covenants helps answer that question?
Alma states in Mosiah 18:4, 31
4 And it came to pass that as many as did believe him did go forth to a place which was called Mormon, having received its name from the king, being in the borders of the land
31 And these things were done in the borders of the land, that they might not come to the knowledge of the king.
So from these verses we learn that the Waters of Mormon are near the border of the land.
We learn from scripture where the borders of the land are located D&C 54:8 states missionaries were sent out to Missouri. Missouri is stated as the borders of the Lamanite lands.
8 And thus you shall take your journey into the regions westward, unto the land of Missouri, unto the borders of the Lamanites.
The borders of the Lamanites is located in Missouri just like the Waters of Mormon are located in Missouri. Its large outflow of water could easily be described as a fountain in its simplest terms.
For a basic layout of the geography of the Nephites and Lamanites see map
http://bookofmormonevidence.blogspot.com/2016/09/six-sea-model-alma-chapter-22-bom-map.html