The only named river in Book of Mormon lands is Sidon; other unnamed rivers are mentioned only in the (Jaredite) Land Northward:
3 …there were an exceedingly great many who departed out of the land of Zarahemla, and went forth unto the land northward to inherit the land.
4 And they did travel to an exceedingly great distance, insomuch that they came to large bodies of water and MANY RIVERS. (Helaman 3)4 And it came to pass that we did march forth to the land of Cumorah, and we did pitch our tents around about the hill Cumorah; and it was in a land of many waters, RIVERS, and fountains; and here we had hope to gain advantage over the Lamanites (Mormon 6)
Rivers not included:
- Old World rivers
- Dreams
- Figurative expressions