Ether Chap­ter 15 dis­cuss­es the end of the Jared­ite peo­ple through war. Two oppos­ing fac­tions fight until the death of all those involved. From the Book of Mor­mon we can derive the exact loca­tion of the waters of Ripliancum

This loca­tion is based on the Six Sea Model
http://​bookof​mor​monev​i​dence​.blogspot​.com/​2​0​1​6​/​0​9​/​a​l​m​a​-​c​h​a​p​t​e​r​-​2​2​-​b​o​m​-​m​a​p.html

Ether 15

7 And when Cori­antumr saw that he was about to fall he fled again before the peo­ple of Shiz.

After one par­tic­u­lar bat­tle Cori­antumr camps his armies next to the waters of Ripli­an­cum. The waters of Ripli­an­cum are described as large or to exceed all. It’s not described as a sea, lake, or riv­er. All we know is its exceed­ing­ly large. This is the only time that exceed­ing­ly large is used to describe a water fea­ture but keep in mind sea or lake is not used to describe this water feature.

8 And it came to pass that he came to the waters of Ripli­an­cum, which, by inter­pre­ta­tion, is large, or to exceed all; where­fore, when they came to these waters they pitched their tents; and Shiz also pitched his tents near unto them; and there­fore on the mor­row they did come to battle.

The next day the armies battle.

10 And it came to pass that the armies of Cori­antumr did press upon the armies of Shiz that they beat them, that they caused them to flee before them; and they did flee south­ward, and did pitch their tents in a place which was called Ogath.

The armies retreat.

11 And it came to pass that the army of Cori­antumr did pitch their tents by the hill Ramah; and it was that same hill where my father Mor­mon did hide up the records unto the Lord, which were sacred.

Cori­antumr camps his army next to the Hill Ramah the place were Mor­mon hid the records. Mor­mon 6:6 states that Mor­mon hid the records in the Hill Cumorah. The waters of Ripli­an­cum could be noth­ing more than Nia­gara Falls the largest water­fall found in the Unit­ed States and com­pa­ra­ble to the great water­falls found through­out the world. Hill Cumorah is about 60 miles away from Nia­gara Falls. Giv­en the exceed­ing­ly large flow of water I do not see how the Book of Mor­mon could fail to men­tion the grandeur of Nia­gara Falls.